Determine if 33, 121, 9, 96 are in proportion.

The correct answer is No

33:121 = $\dfrac{33}{121}$ = $\dfrac{3}{11}$

9:96 = $\dfrac{9}{96}$ = $\dfrac{3}{32}$

∴ 3:11 ≠ 3:32

Hence 33, 121, 9, 96 are not in proportion.