Let $X$ and $Y$ be two random variables such that $E[X] = 2$, $Var(X) = 4$, $E[Y] = 5$, and $Var(Y) = 9$. The correlation between $X$ and $Y$ is given by $\rho(X, Y) = 0.25$. Calculate the variance of the random variable $Z = 3X - 4Y + 12$.