Question

The 4 th proportional to 1.2, 3.9 and 2 is
a) 6.5 b) 5.6 c) 1.6 d) 4

Answer 1

Answer:

Let, the 4th proportional be 'x'.

1.2:3:9::2:x

1.2x = 3.9×2

1.2x = 7.8

x = 6.5

The required 4th proportional is 6.5.

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