PRE-ALGEBRA
Lesson 95 of 171

PROPORTION
Solving Proportions
Students learn to solve proportions using cross products. For example, to solve the proportion 9/15 = 6/d, remember that the cross products of a proportion must be equal, so 9 x d = 15 x 6, or 9d = 90, and dividing both sides by 9, d = 10.
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