Question

2 1/2, 2 6/7,3 1/2 find the fourth proportion​

Answer 1

Answer:

answer is 21

Step-by-step explanation:

1:3::7:x …(1) or

1/3 = 7/x, cross multiply to get

1*x = 3*7, or

x = 21.

Another way of putting it is: in (1) the product of the means = the product of the extremes. So

1x = 3*7, or

x = 21