Question

If the last three terms of a proportion are 5,21 and 35
respectively, then the first term is_____

Answer 1

Answer:

Step-by-step explanation:

Let the first term be x.

∴ x : 5 = 21: 35

Product of extremes = Product of means

x × 35 = 5 × 21

x = ( 5 × 21 ) / 35

x = 3 is the answer.

Therefore, the first term is 3.