Ratio Rates and Constant of Proportionality

Find the Unit Rate.

405 rotations in 5 minutes

• 81 rotations per minute

• 73 rotations per minute

• 18 rotations per minute

• 810 rotations in 10 minutes

Find the Unit Rate.

72 ounces for 12 servings

• 7 ounces per serving

• 144 ounces for 24 servings

• 6 ounces per serving

• 36 ounces for 6 servings

When two quantities simplify to a constant ratio they have a ...

• Proportional Relationship

• Non Proportional Relationship

Does the table represent a proportional relationship?

• Yes.

• No.

What is the constant of proportionality?

• 15

• 5

• 75

• 25

Solve the proportion.

• 9

• 4.5

• 216

• 12

In an animal shelter, the ratio of dogs to cats is 5 to 3. There are 25 dogs. Write and solve a proportion to find the number c of cats.

• c=15

• c=18

• c=21

• c=16

Does the table represent a proportional relationship?

• Yes.

• No.

Based on the information in the table, what is the constant of proportionality?

• k = 8

• k = 20

• k = 5

• k = 10

How do you find the constant rate, or the constant of proportionality?

• k = t + x

• k = x/y

• y = k - x

• k = y/x