Suppose that there are two measurable cardinals $\kappa\lt\delta$ in $V$. Perform forcing in two steps: first, we form the forcing extension $V[G]$ by the Levy collapse making $\kappa$ become $\omega_1$. The standard arguments (I think due to Prikry) show that $\kappa=\omega_1^{V[G]}$ now carries a precipitous ideal in $V[G]$. Next, we form the extension $V[G][H]$ by pumping up $2^\omega=\delta$ by random real forcing in such a way that $\delta$ is now real-valued measurable, a result due to Solovay. (Both of these arguments are in Kanamori's text.) 

Since $V[G][H]$ is a ccc extension of $V[G]$, it follows by a theorem of Kakuda that the precipitous ideal of $V[G]$ generates a precipitous ideal on $\omega_1$ in $V[G][H]$. Thus, in $V[G][H]$ we have both a precipitous ideal on $\omega_1$ and the continuum is a real-valued measurable cardinal. 

More generally, if you don't insist that the real-valued measurable cardinal is actually the continuum or less, then all that you need is just a measurable above, and so the forcing $H$ is not required. That is, $V[G]$ already has a precipitous ideal and a measurable cardinal $\delta$, which is also real-valued measurable.