If `x,5.4,5,9` are in proportion then `x` is

If 5, 15, 3 and x are in proportion, then find the value of x.

If 2, 5, 8, x are in proportion, the value of x is ______.

If x is the fourth proportional to 36, 48 and 15, and 4.2, y, 9 and 13.5 are in proportion, then the difference between y and x is:

If (x + 4), (x + 12), (x - 1), and (x + 5) are in proportion then the mean proportional between x and (x - 7)is:

If 4,x,9 are in continued proportion,find the value of x.

If 5, 15, 3 and x and x are in proportion, then find the value of x.

Find the value of x, if 2, 16, 5 and x are in proportion.

Find x iff 2,7,5 ((x)/(2)) are in proportion.

Verify whether 1, 5, 9 and 45 are in proportion.