RRB NTPC 17 January 2017 Paper

Question : 30 of 120

Marks: +1, -0

Find the fourth proportional 2, 3, 6.

Solution:

(1) 2, 3, 6, ?
Let the fourth no. of the proportion be x.

Now when, a, b, c, d are in proportion,

a/b

c/d

⇒

2/3

6/x

⇒ x=9

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