Question

Solve:$\frac{5}{7}=\frac{\dots }{28}=\frac{35}{\dots }=\frac{\dots }{3.5}$

Answer 1

$\frac{5}{7}=\frac{x}{28}=\frac{35}{y}=\frac{z}{3.5}$

Let x, y and z be three unknown number

$\frac{5}{7}=\frac{x}{28}$ $\frac{20}{28}=\frac{35}{y}$

$x=20$ $y=\frac{28\times 35}{20}=49$

$y=49$

$\frac{35}{49}=\frac{z}{3.5}$

$z=\frac{35\times 3.5}{49}=\frac{5\times 3.5}{7}=5\times 0.5=2.5$

$z=2.5$

$\frac{5}{7}=\frac{20}{28}=\frac{35}{49}=\frac{2.5}{3.5}$.