Proportions and Cross Products

Solve.

• b = 3

• b = 1/3

• b = 18

Solve the proportion:

• 3

• 4

• 9

• 6

Do the ratios form a proportion?

• Yes, they form a proportion.

• No, they do not form a proportion.

Are these proportions equal: 2/3 and 4/6?

• YES

• NO

Will spent $3.75 for 3 pounds of granola. What is his unit rate in dollars per pound?

• $1.25 per pound

• $1 per pound

• $2 per pound

• $1.50 per pound

What are proportions?

• 1 ratio

• a comparison of 3 ratios

• a comparison of 2 ratios

• multiple of fractions

What would the new equation be after using cross multiplication?

• q = 2

• q = 9

Using your equation from before, what is q ?

• q = 2

• q = 9

• q = 9/2

• q = 2/9

What is the new equation after you cross multiply?

• 25x

• 4/25

What is the value of x ?

• x = 25/4

• x = 25

• x = 4/25

• x = 4