In the reaction, $\text{Fe(OH)}_{3(\text{s})} \rightleftharpoons Fe^{3+}_{\text{(aq)}} + 3OH^-_{\text{(aq)}}$, if the concentration of $OH^-$ ions is decreased to $\frac{1}{4}$ of its original value, then the equilibrium concentration of $Fe^{3+}$ will increase by