256/x=x/4

$${\frac{{\mathtt{256}}}{{\mathtt{x}}}} = {\frac{{\mathtt{x}}}{{\mathtt{4}}}}$$          =>      $${{\mathtt{x}}}^{{\mathtt{2}}} = {\mathtt{256}}{\mathtt{\,\times\,}}{\mathtt{4}}$$    =>    $${\mathtt{x}} = {\sqrt{{\mathtt{256}}{\mathtt{\,\times\,}}{\mathtt{4}}}}$$     

$${\mathtt{x}} = {\sqrt{{\mathtt{256}}{\mathtt{\,\times\,}}{\mathtt{4}}}} \Rightarrow {\mathtt{x}} = {\mathtt{32}}$$         x1 = +32   ;   x2 = -32

Gruß radix !