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Answer :
Let the number to be filled in the blanks be a, b, c and d respectively.
Therefore, \(\frac{1}8=\frac{4}a\)
\(\Rightarrow a=32\)
\(\frac{1}8=\frac{7}b\)
\(\Rightarrow b=56\)
\(\frac{1}8=\frac{12}c\)
\(\Rightarrow c=96\)
\(\frac{1}8=\frac{20}d\)
\(\Rightarrow d=160\)
Hence, we have the required value of bases as: