\[\boxed{\mathbf{175}.}\]
\[1)\ b_{1} = - \frac{1}{32};\ \ b_{4} = \frac{1}{4}\]
\[b_{4} = b_{1} \cdot q^{3}\]
\[- \frac{1}{32} \cdot q^{3} = \frac{1}{4}\]
\[q^{3} = - 8\]
\[q = - 2.\]
\[2)\ b_{1} = - 50;\ \ b_{5} = - 0,08:\]
\[b_{5} = b_{1} \cdot q^{4}\]
\[- 50 \cdot q^{4} = - 0,08\]
\[q^{4} = - 0,08\ :( - 50)\]
\[q^{4} = 0,0016\]
\[q = \pm 0,2.\]