A. 4 500 = R 5

B. 500 R = 5 4

C. 500 5 = R 4

D. R 500 = 5 4

Incorrect: This proportion would calculate the length of the line segment that would be used to model a 5 meter long road.

Incorrect: This proportion would be used if a 5 centimeter line represented a 500 meter long road.

Correct: This proportion calculates the scale factor to change from a 4 centimeter line to a 5 centimeter line and then applies that scale to a 500 meter long road.