Which ratios are proportional to 14 : 21? Choose all answers that are correct.

A. 2 : 3

B. 3 : 2

C. 28 : 63

D. 56 : 84

2 : 3 (reduced by a factor of 7 from 14 : 21) and 56 : 84 (increased by a factor of 4)

Let's turn that ratio into a fraction: 14/21

14/21 ... Let's pull some common factors out.

If I remember my times tables, 7 fits into both 14 and 21 so let's divide the top and bottom by 7:

2/3

And 2/3 is the same as 2:3