Question

10. If second, third and fourth terms of a proportion are 18, 10 and 20
respectively, then find the first term.
( Show full process. Don't write the answer directly.​

Answer 1

Step-by-step explanation:

let the first term be x

x:18::10:20

product of extreme=product of means

x*20=10*18

x=10*18/20

x=9

Answer 2

ANSWER:

a:b :: c:d or in other words a:b = c: d, then the quantity 'd' is what we call the fourth proportional to a, b and c. For example, if we have 2, 3 and 4, 5 are in the proportion such that 2 and 5 are the extremes, then 5 is the fourth proportional to 2, 3, and 4.