SSC GD Constable 2021 · Question 250 of 377
ratio-proportion
Given: 9, 21, and 123 Concept used: If A : B :: C : D then (B × C) = (A × D) Calculation: Let the fourth proportion be F. The proportion becomes = 9 : 21 :: 123 : F According to the concept, 21 × 123 = 9 × F ⇒ F = (21 × 123)/9 ⇒ F = 287 ∴ The fourth proportion is 287.
Source: SSC GD Constable 2021 Prev. Year Paper (2021-11-29 Shift 1) English — Prepp (with solutions) · reliable-secondary
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