Question

Determine which of the following ratios form a proportion.

• A. 13:14::39:42
• B. 11:1::33:3
• C. 16:15::48:45
• D. All of these

Answer 1

Answer: (A), (B)

The correct options are
A

13:14::39:42

B

11:1::33:3

Equivalent or equal ratios form a proportion.

So, the first two given options are equivalent as they are equal in their simplest forms.

$\left(A\right)13:14::39:42\Rightarrow (13\times 3):(14\times 3)::39:42$

$\left(B\right)11:1::33:3\Rightarrow (11\times 3):(1\times 3)::33:3$

$\left(C\right)16:15::4:3\text{(This is not a proportion)}$