What does it mean to be proportional?

When two ratios are equal, they are PROPORTIONAL Example: 2 = x 6 = 30 2 x 15 = 30 Look! There cross Products are equal!!

Try These 6 ? ?

Are these equal proportions? 6 feet 9 feet 10 sec 15 sec ?=?= 4 feet 12 sec 6 ft 18 sec ?=?= 5 feet 4 sec 10 sec 8 ft ?=?= The units are the same going across The units are NOT the same going across or down The units are the same going down

Try These 5 miles ? 15 hour 2 hours = 6 miles $12 ? $3 32 min 8 min

What does “n” equal? 10 n 15 3

Solving Proportions Using Cross Products 1)Cross Multiply 2)Divide both sides by the value next to x 3) Solve and label

Practice Problems x =

4 6 x 15 =

x =

On Monday, Jenny makes $125 after working 5 hours. Making the same rate of money, how much money would Jenny make working 12 hours?

Susie made punch for a party. She mixed 2 cups of fruit juice with 5 cups of ginger ale. Using this ratio, how much ginger ale would she use if she mixed in 5 cups of fruit juice?

Homework Time Proportions wkst