Question : Find the fourth proportional of 22, 66 and 11.
Option 1: 23
Option 2: 33
Option 3: 17
Option 4: 39
Correct Answer: 33
Solution : Given numbers: 22, 66, and 11 Let the fourth proportion be $x$. For the numbers a, b, c, and d if a ∶ b ∶ ∶ c ∶ d then, ad = bc Where d is the fourth proportional of a, b, and c. ⇒ $22x=66\times 11$ ⇒ $x=\frac{66\times 11}{22}$ ⇒ $x=33$ Hence, the correct answer is 33.
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