Solving Proportions

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What is a proportion?

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A proportion is an equation that states that two ratios are equal.

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CCSS.7.RP.A.2A

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How do you solve a proportion?

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To solve a proportion, cross-multiply the terms and then isolate the variable.

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CCSS.6.EE.B.7

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What is the cross-multiplication method?

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The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

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CCSS.6.RP.A.3A

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CCSS.5.NF.B.5B

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x = 5.

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CCSS.7.RP.A.2C

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x = 15.

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CCSS.7.RP.A.3

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y = 22.4.

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CCSS.7.RP.A.2C

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What does it mean if two ratios are equivalent?

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If two ratios are equivalent, it means they represent the same relationship between quantities.

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CCSS.6.RP.A.3A

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c = 8.

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CCSS.7.RP.A.2B

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The ratios a:b and c:d are equivalent.

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CCSS.6.RP.A.3A