Whats the math behind converting from square pixels to non-square...?

Does anyone know the math behind resizing a video from square pixel to non-square?
Say if I have a 720x480 4:3 video and I render it out as square pixels. So then I need to resize it down to non-square so that it will no longer be stretched....I know I can just use premiere or quicktime to scale it properly for me but what is the math behind it? I'll admit im no mathematician, all i know is that square pixels = 1 and dv = .9, how you go from there is beyond me.
Reason I ask is because I have a 800x600 video in square pixels and just want to know how in the world it makes sense that you change it to 755x600 and the stretch is gone. How does do you get to that number?
Many thanks in advance!

I don't have CS4, and have only been scanning the CS4 forums; so there may be better links regarding this in this forum. CS4 changed the par to a more "correct" option. It is not .9 now but .91. (See Dan's little "about" before the .9.) And when you are dealing with 800x600, there may be other issues.
I like the AE/Meyers explanations of all this (so also see the regular help for Premiere):
http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7f3aa.htm l
There are 2 pdf article links on that page.
Also see the free Meyers video on Lynda.com
http://www.lynda.com/home/Player.aspx?lpk4=40550
EDIT: I missed the more relevant thing in Dan's: see the 10/11 as the multiplier rather than .9? 10/11 is the "new" .909090 = .91.
Message was edited by: Stan Jones

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