Solve Proportions Easy

To solve for missing info in a proportion statement you must first

• Cross multiply

• Divide everything

• Get rid of variables

• Guess

Two out of every 3 students in Mr. Pearson’s ninth grade class recycle aluminum cans. If 48 students recycle aluminum cans, HOW MANY STUDENTS are in Mr. Pearson’s class?

Cindy’s job is to check computer printers for defects. Out of 420 printers she has to check, only 3 of the first 84 have been defective. Using this information, what is the best prediction of the TOTAL NUMBER OF DEFECTIVE PRINTERS?(Set up your ratio)

Sandra wants to give a party for 60 people. She has a punch recipe that makes 2 gallons of punch and serves 15 people. How many gallons of punch should she make for her party?

Solve for x 

• x = 1/10

• x = 10

• x = 4

• x = 5

Solve for x 

• x = 16

• x = 28

• x = 1/26

• x = 26

Solve the proportion.

• 10.8

• 7.5

A model airplane is made to the scale 1 inch to 24 inches. If the wing of the actual plane is 18 feet long, how long will the model wing be in inches?

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

• x = 1/24
• x = 29
• x = 28
• x = 3/2