Applying Proportion to Scale Models

What is the scale factor from triangle ABC to triangle DEF?

• 1/2
• 7/12
• 2
• 10/12

If the scale factor is 4, what is the measurement of x?

• 20 m
• 24 m
• 16 m
• 4 m

Megan drew a scale drawing of a house and its lot. The scale she used was 1 inch = 2 feet. The backyard is 78 feet long in real life. How long is the yard in the drawing?
____ = ____

• 39 inches
• 156 inches
• 38 inches
• 157 inches

Solve the proportion.
____ = ____

• p=31.3
• p=308
• p=924
• p=532

Do the ratios form a proportion?
____ = ____

• Yes, they form a proportion.
• No, they do not form a proportion.

Find missing side

• 5
• 7
• 9
• 11

Find the perimeter of the large triangle.

• 24
• 36
• 12
• 54

The pair of figures are similar. Find the missing side.

• x = 1
• x = 3
• x = 9
• x = 5

The scale drawing car length is 3 cm. If the scale is 1 cm:4 ft, what is the actual car length?

• 12 feet
• 16 feet 
• 10 feet
• 4 feet

The two right triangles below are similar. What is x, the missing side length in triangle DEF? 

• 3.75
• 9.75
• 10
• 12