proportions

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What is a proportion?

Back

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?

Back

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

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CCSS.7.RP.A.2C

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Back

x = 26

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CCSS.7.RP.A.2B

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Back

n = 5.5

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CCSS.7.RP.A.2B

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Back

x = 15

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CCSS.7.RP.A.2B

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Back

x = 28

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CCSS.7.RP.A.3

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Back

x = 20

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CCSS.6.EE.A.1

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What does cross-multiplication mean in proportions?

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Cross-multiplication means multiplying the numerator of one ratio by the denominator of the other ratio.

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CCSS.7.RP.A.3

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Back

The relationship is that a times d equals b times c (ad = bc).

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CCSS.4.NF.A.1

CCSS.5.NF.B.5B

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Back

The first step is to cross-multiply: 5 * 20 = 10 * x.

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CCSS.7.RP.A.2C