CGLQuantitative AptitudeRatio & Proportion — EssentialsCurated by Prabhakar Bhatt, Founder of क्रांति · Last reviewed 2 July 2026# Ratio & Proportion - If a:b = c:d then ad = bc. - Compound ratio of a:b and c:d is ac:bd. - Mean proportion of a and b = √(ab). Divide ₹840 in ratio 3:4 → ₹360 and ₹480.