[tex]\displaystyle\bf\\Produsul~mezilor = produsul~extremilor.\\\\5\times16=80\\4\times20=80\\\\\textbf{Corect, dar si rapoartele trebuie sa fie egale.}\\\\\frac{16}{4}=\frac{20}{5}\\\\ unde~~extremii~sunt~5~si~16,~iar~mezii~sunt~4~si~20.\\\\Verificam~egalitatea~rapoartelor:\\\\\frac{16}{4}=4\\\\\frac{20}{5}=4\\\\Corect.[/tex]
Daca schimbam mezii intre ei, se obtine o alta proportie corecta.
Daca schimbam extremii intre ei, se obtine o alta proportie corecta.
