A ratio of $4$:$2$:$1$ is the same as

$40\%$:$20\%$:$10\%$

$\frac{4}{7}$:$\frac{2}{7}$:$\frac{1}{7}$

$7/4$:$7/2$:$7/1$

$\frac{4}{10}$:$\frac{2}{10}$:$\frac{1}{20}$