Scale Factors and Proportions

Solve for r.

• 1

• 16

• 12

• 18

Solve for x.

• 7

• 6

• 5

• 12

• 1:23

• 250:1

• 8:6

• 16:3

What is the ratio of apples to pieces of fruit?

Hint: If the scale factor is 1:6 that means you multiply by 6.

Mathematical Equivalence

ON

A ~ B. What is the scale factor from A to B?

• 4/3

• 2/3

• 3/2

• 3/4

If the scale factor is 1 : 2.5, that means each side in figure B is 2.5 times as big as each side in figure A.

How long is side S?

Mathematical Equivalence

OFF

If the scale factor is 1:2, that means each side in figure B is twice as big as each side in figure A.

Mathematical Equivalence

ON

6 x 1.5 = 9

4 x 1.5 = 6

5 x 1.5 = 7.5

1.5 is the scale factor.

• 10 miles

• 5 miles

• 6 miles

• 8 miles