Question

Which pair of ratios makes a proportion?

A. 1/4 and 5/25
B. 1/4 and 7/24
C. 1/4 and 10/48
D. 1/4 and 9/36

Answer 1

• D. 1/4 and 9/36

Explanation:

If two ratios make a proportion then it can be shown as:

• a/b = c/d ⇒ ad = bc

Let's verify the answer choices with this method

A. 1/4 and 5/25

• 1*25 = 4*5
• 25 = 20, incorrect, not a proportion

B. 1/4 and 7/24

• 1*24 = 4*7
• 24 = 28, incorrect, not a proportion

C. 1/4 and 10/48

• 1*48 = 4*10
• 48 = 40, incorrect, not a proportion

D. 1/4 and 9/36

• 1*36 = 4*9
• 36 = 36, correct, this is a proportion