Question

first third and fourth terms of the proportion are 7,35 and 45 respectively the second term is

Answer 1

let the second term be X than
7/X = 35/45
X = (7*45)/35 = 9 answer

Answer 2

Since
Product of means is equal to the product of extremes

7:x::35:45
(35)(x)=(7)(45)
X=(7)(45)/(35)
X=(45)/5
X=9




Hope it helps...