\(\hept{\begin{cases}\frac{x}{y}=\frac{2}{3}\\\frac{t}{y}=\frac{4}{9}\end{cases}}\Rightarrow\frac{x}{y}:\frac{t}{y}=\frac{2}{3}:\frac{4}{9}\Leftrightarrow\frac{x}{y}.\frac{y}{t}=\frac{2}{3}.\frac{9}{4}\Leftrightarrow\frac{x}{t}=\frac{3}{2}\)
\(\hept{\begin{cases}\frac{x}{t}=\frac{3}{2}\\\frac{z}{t}=\frac{5}{8}\end{cases}}\Rightarrow\frac{x}{t}:\frac{z}{t}=\frac{3}{2}:\frac{5}{8}\Leftrightarrow\frac{x}{t}.\frac{t}{z}=\frac{3}{2}.\frac{8}{5}\Leftrightarrow\frac{x}{z}=\frac{12}{5}\)
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