Question

what will be fourth proportion of 3.50,4.20 and2.50??? ans. plss
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Answer 1

Step-by-step explanation:

If a:b :: c:d or in other words a:b = c: d, then the quantity ‘d’ is what we call the fourth proportional to a, b and c.

For example, if we have 2, 3 and 4, 5 are in the proportion such that 2 and 5 are the extremes, then 5 is the fourth proportional to 2, 3, and 4.

Example 1: Find the fourth proportional to 4, 9 and 12?

A) 18 B) 21 C) 24 D) 27

Answer: Let the fourth proportional to the numbers 4, 9, and 12 be x. Then from the definition of the fourth proportional, we must have:

4: 9 :: 12 : x or in terms of the fractions we can write;

4x = 9 × 12. In other words, we have x = {9 × 12}/4 = 27. Thus the correct option is D) 27.

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