Answer :
[tex]\stackrel{\textit{geometric mean of 4 and 22}}{\cfrac{4}{x}=\cfrac{x}{22}}\implies 88=x^2\implies \sqrt{88}=x\implies 2\sqrt{22}=x[/tex]
[tex]\stackrel{\textit{geometric mean of 4 and 22}}{\cfrac{4}{x}=\cfrac{x}{22}}\implies 88=x^2\implies \sqrt{88}=x\implies 2\sqrt{22}=x[/tex]