In the given figure, ABC ∼ QPR. If AC =6 cm, BC =5 cm, QR =3 cm and PR = x; then the value of x is:

In the given figure, $\displaystyle \triangle \mathrm{ABC} \sim \triangle \mathrm{QPR}$. If $\displaystyle \mathrm{AC}=6 \mathrm{~cm}, \mathrm{BC}=5 \mathrm{~cm}$, $\displaystyle \mathrm{QR}=3 \mathrm{~cm}$ and $\displaystyle \mathrm{PR}=\mathrm{x}$; then the value of x is :