Proportions Similar Figures and Constant of Proportionality

What is the constant of proportionality for this table?

• 1/9

• 9

• 8

• This is not a proportion

The pair of figures is similar. Find the missing side.

• x = 12

• x = 3

• x = 40

• x = 4

How can you find the constant of proportionality?

• k = y/x

• k = x/y

• E=mc²

• y = kx

You spend $40 on 5 pounds of concrete. What is the unit rate in dollars per pound?

• $8 per pound

• $5 per pound

• $35 per pound

• 0.125 pounds per dollar

What is the constant of proportionality?

• 7

• 14

• 10

• 21

Identify the constant of proportionality

• k = 1/90

• k = 1/30

• k = 90

• k = 30

Name the constant of proportionality.

• 20

• 40

• 16

• 35

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none

Identify the unit rate (scale factor) in this equation.

• 2x

• 2

• 4

• none

Pat needs 14 sticks of pepperoni to make 28 pizzas. How many sticks of pepperoni are needed to make 36 pizzas?

• 15 sticks

• 24 sticks

• 18 sticks

• 36 sticks