A closed organ pipe of length $L$ and an open organ pipe contain gases of densities $\rho _ { 1 }$ and $\rho _ { 2 }$ respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open pipe is $\frac { x } { 3 } L \sqrt { \frac { \rho _ { 1 } } { \rho _ { 2 } } }$, where $x$ is $\_\_\_\_$.\\
(Round off to the Nearest Integer)