Solving Proportions

Front

What is a proportion?

Back

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

Tags

CCSS.7.RP.A.2A

Front

How do you solve a proportion?

Back

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

Tags

CCSS.7.RP.A.2C

Front

What does it mean if two ratios do not form a proportion?

Back

It means that the two ratios are not equivalent and do not represent the same relationship.

Tags

CCSS.6.RP.A.3A

Front

If a/b = c/d, what is the cross-multiplication method?

Back

The cross-multiplication method states that a*d = b*c.

Tags

CCSS.5.NF.B.5B

Front

Solve for x: 2/3 = x/12

Back

x = 8.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

Solve for x: 5/x = 15/9

Back

x = 3.

Tags

CCSS.7.RP.A.3

Front

What is the first step in solving the proportion 4/5 = x/20?

Back

Cross-multiply to get 4*20 = 5*x.

Tags

CCSS.7.RP.A.2C

Front

If 3/4 = x/16, what is x?

Back

x = 12.

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CCSS.4.NF.B.4B

CCSS.4.NF.B.4C

Front

What is the value of x in the proportion 7/x = 14/2?

Back

x = 1.

Tags

CCSS.7.RP.A.2C

Front

If 8/12 = x/18, how do you find x?

Back

Cross-multiply to find x = 12.

Tags

CCSS.7.RP.A.2B