hello(adsbygoogle = window.adsbygoogle || []).push({});

we have been covering direct and inverse proportion at school. Are there any other types of proprtion?

We've been coming across questions like:

x is directly proportion to Y

Then I've been told to write

X (the proportion sign, which is like 8 on its side) Y

X=ky

We are then given a value for x and a value for y and asked to work out k. I'm fine with that but I'm wondering why we have to put "k"? Why does that proportion sign turn into "K"?

Also i was looking at the friedmann equation and i saw it had a "k" in it. When i see a physics equation like that will the K usually mean "constant" and will it have something to do with proportion?

thanks _Muddy_

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Direct/Inverse proportion

**Physics Forums | Science Articles, Homework Help, Discussion**