RRB NTPC · Ratio & Proportion Concepts

Exercise and reference answers

Matching pairs

1. Left

   Fourth proportional to 4, 9, 12

   Right

   27

2. Left

   Mean proportional of 16 and 25

   Right

   20

3. Left

   Ratio of 2 hours to 40 min

   Right

   3 : 1

4. Left

   Duplicate ratio of 3 : 5

   Right

   9 : 25

Instructions

Match each proportion problem to its result