Question 737093
x y z are in geometric 

x/y = y/z

OR y^2=xz


x^2, y^2, z^2

x^2, xz, z^2

If they are in geometric sequence then

xz/x^2 = z^2/xz

z/x = z/x

The ratios are common

so x^2,y^2 & z^2 is a GP