Find the third proportional to 24 and 60.

This question was previously asked in
RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 2).
View all RRB ALP Papers >
  1. 144
  2. 120
  3. 164
  4. 150

Answer (Detailed Solution Below)

Option 4 : 150
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Detailed Solution

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Concept:

The third proportional proportion is the second term of the mean terms.

For example, if we have a ∶ b = c ∶ d, then the term ‘c’ is the third proportional to ‘a’ and ‘b’.

Represented as:

a : b ∷ b : c

Calculation:

a : b ∷ b : c

⇒ 24 : 60 ∷ 60 : c

⇒ 24/60 = 60 / c

⇒ c = (60 × 60)/24 = 150

∴ The third proportional is 150.

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