Solve Proportions Using Cross Products

What would the new equation be after using cross multiplication?

• q = 2

• q = 9

What is the new equation after you cross multiply?

• 25x

• 4/25

What is NOT a correct way to find the missing number?

• Check for a multiplication or division relationship

• Use Cross Products (cross multiply)

• Divide the top and bottom by the same number to simplify 3/12

• Typing the two fractions into the calculator and letting it do the math

What is the missing number for this proportion?

• 1

• 3

• 9

Solve using cross products:
5/6 = x/12

• x = 10

• x = 1

• x = 12

• x = 11

• 3

• 4

• 5

• 6

• 5

• 10

• 15

• 20

• 8

• 10

• 12

• 14

• x = 3

• x = 1

• x = 12

• x = 48

Solve this proportion for X.

• x = 3

• x = 1

• x = 12

• x = 48