Solve Proportions 74B

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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 does cross-multiplication mean?

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Cross-multiplication involves multiplying the numerator of one fraction by the denominator of the other fraction.

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CCSS.5.NF.B.5B

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CCSS.4.NF.A.1

CCSS.5.NF.B.5B

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x = 4.5.

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CCSS.5.NF.B.5B

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CCSS.HSA.REI.A.2

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If there are 5 ice cream cones for every 3 brownies, how do you set up the proportion?

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CCSS.7.RP.A.2A

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r = 2.67.

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CCSS.6.EE.B.7

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What is the relationship between ratios and proportions?

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Ratios compare two quantities, while proportions state that two ratios are equal.

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CCSS.6.RP.A.3A

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How can you check if your solution to a proportion is correct?

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Substitute the solution back into the original proportion to see if both sides are equal.

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CCSS.6.EE.B.7