Lesson 3.3 Writing and Solving Proportions Practice

What value of x makes this proportion true?

 $\frac{14}{20}=\frac{56}{x}$  

• 62
  

• 70

• 80

• 100

What value of d makes this proportion true?

 $\frac{6}{16}=\frac{d}{12}$  

• 3.2
  

• 4.5

• 8

• 8.5

What value of y makes this proportion true?

 $\frac{15}{35}=\frac{y}{224}$  

• 90
  

• 93

• 96

• 99

Which pair of ratios does NOT form a true proportion

• 8:14 and 20:35

• 6 to 10 and 15 to 25

• $\frac{9}{4}=\frac{36}{16}$

• 12:15 and 30:40

Solve the proportion.

 $\frac{10}{7}=\frac{8}{k}$  

• 4.6
  

• 5.6

• 6.6

• 7.6

Set up a proportion to solve the following. I walked 15 miles in 2.5 hours today. If I walked 4 hours yesterday how many miles did I walk?

• $\frac{15}{2.5}=\frac{m}{4}$

• $\frac{15}{2.5}=\frac{4}{m}$

• $\frac{15}{m}=\frac{4}{2.5}$

• $\frac{2.5}{15}=\frac{m}{4}$

You can buy 4 DVDs for $48. Write a proportion that gives the cost c of buying 6 DVDs.

• $\frac{4}{48}=\frac{c}{6}$

• $\frac{4}{6}=\frac{c}{48}$

• $\frac{4}{48}=\frac{6}{c}$

• $\frac{4}{c}=\frac{6}{48}$

Solve the proportion.

 $\frac{2.1}{c}=\frac{1.5}{1.4}$  

• 0.6

• 1.96

• 2.25

• 2.94

Select all the ratios that are equal to

 $\frac{12}{32}$  

•  $\frac{36}{96}$  

•  $\frac{8}{20}$  

•  $\frac{42}{112}$  

•  $\frac{27}{72}$  

The ratio of seventh-grade dancers to all dancers is 5:16. Find the number of seventh-grade dancers on a team of 80 dancers.

• 10

• 25

• 80

• 256