Which pair of ratios is proportional

A. 4/9 and 16/45

B. 5/12 and 25/144

C. 12/18 and 18/27

D. 15/20 and 7/10

A. 4/9 and 16/45

16 / 4 = 4

45 / 9 = 5

Disproportional

B. 5/12 and 25/144

25 / 5 = 5

144 / 12 = 12

Disproportional

C. 12/18 and 18/27

18 / 12 = 3/2

27 / 18 = 3/2

Proportional

D. 15/20 and 7/10

7 / 15 = 7/15

10 / 20 = 1/2

Disproportional

Answer: (c)

Let us check each of these.

A) 4/9 and 16/45

or, 1.44 and 1.355

1.44 ≠ 1.355 (Wrong)

B) 5/12 and 25/144

or, 1.416 and1.17

1.416 ≠ 1.17 (wrong)

C) 12/18 and 18/27

or, 1.66 and 1.66

1.66 = 1.66 (Correct)

D) 15/20 and 7/10

=0.75 and 0.70

0.75 ≠ 0.70

Thus, the answer is (C)