[tex]Daca\;proportia\; transmisa\;este\;\frac{2a*2b}{x}=\frac{ax}{2a}\\
Conform \;proprietatii\;fundamental\u{a}\;a\;proportiilor\;\\
2a*2a*2b=x*ax\;\Rightarrow\; 8a^2b=ax^2\;\Leftrightarrow\;x^2=\frac{8a^{\not2}b}{\not{a}}=8ab\;\\
x=\sqrt{8ab}=2\sqrt{2ab}[/tex]