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Question

The fourth proportional to 2, 3, 4 is 
  1. 5
  2. 23
  3. 6


Solution

The correct option is C 6

Let x be the required fourth proportional.
So, 2, 3, 4 and x are in proportion.
Recall that the rule of proportion states that the product of extremes equals the product of means.
2×x=3×4
2x=12 
x=122=6  
Thus, the fourth proportional to 2, 3, 4 is 6. In other words, 2, 3, 4 and 6 are in proportion.

     

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