1. Define the problem. In order to compute a proportion, the two quantities being compared must be known. For simplicity, let them be called A and B. 2. Determine which quantity is
http://www.ehow.com/how_2310782_calculateproporti...

give me an example.
http://wiki.answers.com/Q/How_do_you_calculate_a_p...

The proportion is 21 out of 30 (21/30) which can be reduced to 7/10. Divide the bottom number into the top number and you get .7 or 70%
http://answers.yahoo.com/question/index?qid=200904...

The number divided usually appears before a "to" or "per" in a problem, and it is being divided by the number after. Express the quantities as numbers. Divide.
http://www.kgbanswers.com/howdoyoucalculateap...
