Register to reply

Ratios and fractions

by Miraj Kayastha
Tags: fractions, ratios
Share this thread:
Miraj Kayastha
#1
Jul31-14, 05:07 AM
P: 76
Why can ratios be written as fractions?

if there are 5 men in 20 people the ratio of men to total people is 5:20 which is 1:4.

But when we write 1/4 it gives 0.25. And 0.25 means the magnitude of each part when 1 is divided into 4 equal parts.

So how does ratio and fraction give a same meaning? Please explain it to me.
Phys.Org News Partner Mathematics news on Phys.org
Math journal puts Rauzy fractcal image on the cover
Heat distributions help researchers to understand curved space
Professor quantifies how 'one thing leads to another'
Char. Limit
#2
Jul31-14, 05:43 AM
PF Gold
Char. Limit's Avatar
P: 1,957
I'm not quite sure what you're asking. A ratio is defined, per Wiktionary, as

ratio (plural ratios)

1. A number representing a comparison between two things.
2. (arithmetic) The relative magnitudes of two quantities (usually expressed as a quotient).
3. (law) Short for ratio decidendi.

Clearly, the second definition is the best used here. If there are 5 men in 20 people, then we can say that on average, 0.25, or 25% of all people are men. That's just another way of saying 25 men for every 100 people, though, which is similar to the 5 in 20 example.

Sorry, I'm probably not making much sense, but the question is an odd one.


Register to reply

Related Discussions
Composites, Volume fractions exceeding Max Packing Fractions Materials & Chemical Engineering 2
P/O ratios Biology, Chemistry & Other Homework 0
Ratios homework problem Introductory Physics Homework 14
Help with ratios Precalculus Mathematics Homework 6
PF ratios General Discussion 6