Asked by BBnewgo
I am working on cross products of proportions. one question is 5/7 = 3w/21
Can someone help?
Can someone help?
Answers
Answered by
drwls
21 w = 105 is the next step if you match the "cross products" of numerator-denominator pairs.
Then divide each side by 21 to get w.
Then divide each side by 21 to get w.
Answered by
Damon
multiply both sides of this equation by 21
(5/7) 21 = (3w/21) 21
5*3 = 3 w
now divide both sides by 3
5 = w
(I do not like the cross multiplication language. It is safer to multiply both sides by a common multiple of the denominators, which is really what cross multiplication means.)
If you did it with cross multipication you would have
5 * 21 = 7 * 3 * w
5 * 21 = 21 * w
5 = w
(5/7) 21 = (3w/21) 21
5*3 = 3 w
now divide both sides by 3
5 = w
(I do not like the cross multiplication language. It is safer to multiply both sides by a common multiple of the denominators, which is really what cross multiplication means.)
If you did it with cross multipication you would have
5 * 21 = 7 * 3 * w
5 * 21 = 21 * w
5 = w
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