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### Question

If 121, x, x and 64 are in proportion, then what is x?

**A**

88.

**B**

92.

**C**

84.

**D**

96.

**Soln.**

**Ans: a**

We have 121 : x :: x : 64, so 121 × 64 = x × x, which gives x = 11 × 8 = 88.