Solving Ratios & Proportions Questions - Get Help Here!

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Discussion Overview

The discussion revolves around solving a problem related to ratios and proportions, specifically involving the weight and length of chains. Participants seek assistance in determining the length of a chain based on its weight, with a focus on understanding the methodology rather than just obtaining the answer.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant presents a problem involving a chain's length and weight, asking for guidance on how to approach the solution.
  • Another participant proposes using a constant length per weight ratio to set up a proportion, suggesting the equation $$\frac{L}{102}=\frac{183}{78}$$ to find the unknown length $L$.
  • A participant calculates the ratio 183/78 and questions whether it needs to be converted to feet.
  • There is a repeated emphasis on solving for $L$ rather than interpreting the ratio directly.
  • Participants discuss rounding the calculated length to the nearest inch and converting the final answer into feet and inches.
  • One participant inquires about the existence of a formula for such problems and whether conversion is a common requirement in ratio questions.
  • Another participant clarifies their reasoning about the similarity of the chains and the implications for the length-to-weight ratio.

Areas of Agreement / Disagreement

Participants generally agree on the approach of using ratios to solve the problem, but there is no consensus on a specific formula or method that applies universally to all ratio-related questions. Some participants express uncertainty about the need for conversions and the application of formulas.

Contextual Notes

Participants express varying levels of familiarity with the concepts of ratios and proportions, leading to questions about the necessity of conversions and the generalizability of methods used in similar problems.

Who May Find This Useful

This discussion may be useful for students seeking help with homework on ratios and proportions, particularly those who are unsure about the methods for solving related problems.

Eabzolid
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Hi. I'm doing some questions about ratio and proportions. I'm just having difficulty with some of the questions and i hope you guys can help. So question 1:

A length of chain 15'-3" long weighs 78lbs. How long would a similar chain be if it weighs 102lbs. (Answer to nearest inch)
Length =_______' _______"

If you can just kind of lead me to how to get the answer, it would be great. Thanks.
 
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Let's let $L$ be the length in question...that the chain is similar implies a constant length per weight ratio, and so we may state:

$$\frac{L}{102}=\frac{183}{78}$$

I converted the length of the 78 lb. chain to inches, since we are to round $L$ to the nearest inch.

Now, solve for $L$...what do you find?
 
183/78= 2.346

Do I need to convert that to feet?

Thanks
 
Eabzolid said:
183/78= 2.346

Do I need to convert that to feet?

Thanks

The RHS of the equation I posted is not the value of $L$...you need to solve that equation for $L$. :D
 
MarkFL said:
The RHS of the equation I posted is not the value of $L$...you need to solve that equation for $L$. :D

Oh okay.

I got 239.30. Do I then convert that to get feet and inches as my answer?

Thanks
 
Eabzolid said:
Oh okay.

I got 239.30. Do I then convert that to get feet and inches as my answer?

Thanks

First, round the number you correctly found to the nearest inch, thus:

$$L\approx239$$

Now, since the length of the first chain was given in feet and inches, I would convert this to the same format. :D
 
MarkFL said:
First, round the number you correctly found to the nearest inch, thus:

$$L\approx239$$

Now, since the length of the first chain was given in feet and inches, I would convert this to the same format. :D

Okay. I'll try

I'm just wondering if there is a formula I should follow? Or does it all depend on what the question is asking.

I got more questions that has 3 ratio number like 9:4:1.

Is it always converting when it comes to these questions?

Thanks
 
For this problem, since the chains were said to be similar, I took this to mean the length per weight ratio would be the same for both chains. So, I decided to label the unknown length $L$, and then equate the length/weight of the two chains and then solve for the unknown length. :D
 
May I ask another question?
 
  • #10
Eabzolid said:
May I ask another question?

If it pertains to the problem posted in this thread, that is, if it is a follow-up question to the chain problem, then please post it in this thread. If you wish to ask about another problem, then please begin a new thread for the new problem. :D
 

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