CMA Foundation · Fundamentals of Business Mathematics and Statistics · Ratios, Variations and Proportions
Find the fourth proportional to 6, 9 and 14.
The fourth proportional to 6, 9 and 14 is 21. It is found from 6:9 = 14:d, so d equals the product of the second and third terms divided by the first, that is 9 times 14 divided by 6, which gives 21.
- A18
- B21Correct
- C24
- D19
Explanation
Fourth proportional d satisfies 6:9 = 14:d, so d = 9 × 14 / 6 = 21. Option 18 results from wrongly adding the differences, and 24 from computing 6 × 14 / 9 ... which is not an integer, so it is simply incorrect.
Did you get it right without looking?
One question tells you little. A timed set on Ratios, Variations and Proportions shows your real accuracy, how long you take and where you lose marks.
More Ratios, Variations and Proportions questions
- What is the compounded ratio of 2 : 3, 9 : 4 and 5 : 6?
- A mixture of 40 litres contains milk and water in the ratio 3 : 1. How many litres of water must be added so that the ratio of milk to water…
- Which of the following is the duplicate ratio of the ratio 3:5, and what is its value when compared with the sub-duplicate ratio of 36:64?
- The number of units of a product demanded in a Surat market varies inversely with its price per unit. At a price of ₹40, the demand is 600 u…
- If 4, x and 25 are in continued proportion with x positive, and the mean proportional x is the second term, what is the value of (x + 4) : (…
- The third proportional to x and 12 is 36. Find the value of x.