Proportions With Variables

Two quantities are proportional if :

• numerator x numerator = denominator x denominator

• unit rates are the same

• one quantity is bigger than the other

Solve for x

• 1/2

• 25/8

• 11

• 53/4

Solving proportions with one variable: What is the value of x in the proportion 6/11 = x/22

• 15

• 12

• 8

• 3

Finding the value of the variable in a proportion: In the proportion 3/4 = 15/x, what is the value of x?

• 5

• 20

• 10

• 25

Finding the value of the variable in a proportion: If 5/8 = 25/x, find the value of x

• x = 50

• x = 15

• x = 40

• x = 30

Finding the value of the variable in a proportion: Solve for x: 2/5 = 10/x

• 0.4

• 50

• 2

• 25

Finding the value of the variable in a proportion: If 4/9 = 36/x, what is the value of x

• 81

• 48

• 25

• 12

If 2/3 = n/9, what is the value of n?

• 6

• 4

• 3

• 8

Given 5/8 = n/20, find the value of n.

• 10

• 18

• 12.5

• 15

What is the value of n if 3/4 = n/12?

• 6

• 9

• 15

• 10