Solving Proportions

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What is a proportion?

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A proportion is an equation that shows two equivalent ratios.

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CCSS.7.RP.A.2A

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5x = 120

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CCSS.7.RP.A.2B

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60 = 15c

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CCSS.7.RP.A.2C

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4x = 192

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CCSS.7.RP.A.2B

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15y = 180

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CCSS.7.RP.A.3

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How do you cross-multiply to solve proportions?

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To cross-multiply, multiply the numerator of one ratio by the denominator of the other ratio.

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ad = bc

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What is the first step in solving a proportion?

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Identify the two ratios and set them equal to each other.

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CCSS.7.RP.A.3

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What does it mean if two ratios are equivalent?

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It means they represent the same relationship or value.

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CCSS.6.RP.A.3A

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What is the relationship between the means and extremes in a proportion?

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