is 3/11 = 12/33 a true proportion.

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is 3/11 = 12/33 a true proportion?

Guest Oct 16, 2014

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3/11 = 12/33 ???? cross-multiplying, we have

3 * 33 = 11 * 12

99 = 132

So these two things are not proportional, because cross-products of equal proportions themselves are equal.

CPhill Oct 16, 2014

CPhill · Answer 1 · 2014-10-16T02:55:27

3/11 = 12/33 ???? cross-multiplying, we have

3 * 33 = 11 * 12

99 = 132

So these two things are not proportional, because cross-products of equal proportions themselves are equal.

geno3141 · Answer 2 · 2014-10-16T02:54:41

To test whether or not it is a true proportion, cross multiply:

3/11 = 12/33 --> Is 3 x 33 equal to 11 x 12? If so, it is a true statement, if not, it is incorrect.