[tex] \frac{x}{y}= \frac{3}{7} \\
\frac{y}{z}= \frac{7}{12} \\
---- \\
\frac{x}{z}=? \\
---- \\
Il~scoatem~pe~x~si~z~in~functie~de~y: \\
\frac{x}{y}= \frac{3}{7}~deci~ x= \frac{3y}{7} \\
\frac{y}{z} = \frac{7}{12}~deci~z= \frac{12y}{7} \\
\frac{x}{z}= \frac{ \frac{3y}{7} }{ \frac{12y}{7} }= \frac{3y}{7}* \frac{7}{12y} \\
= \frac{3y}{12y}= \frac{1}{4}[/tex]
