Question

Find the 4th proportional to 42, 12, 7​

Answer 1

Answer:

42:12::7:x

42*x=12*7

x=12*7/42

x=2

Answer 2

let the 4th proportional be x

•°• 42:12::7:x

42/12= 7/x => x= 12*7/42 => x= 2