Question

If 4,x,x,81 are in proportion find the value of x

Answer 1

Answer:

162

Step-by-step explanation:

4:x::x:81

2x=81×4

2x=324

x=324/2

x=162

Answer 2

Answer:

X=18

Step-by-step explanation:

4:x:x:81=

Product of means=product of extremes

$4 \times 81 = 324 = x \times x = x {}^{2}$

$x { }^{2} = 324 \\ x = \sqrt{324 } \\ = 18$

Therefore x=18