\[\boxed{\text{5.327.}}\]
\[\frac{4}{5} = \frac{4 \cdot 6}{5 \cdot 6} = \frac{24}{30}\ \]
\[\frac{7}{8} = \frac{7 \cdot 6}{8 \cdot 6} = \frac{42}{48}\ \]
\[\frac{13}{15} = \frac{13 \cdot 6}{15 \cdot 6} = \frac{78}{90}\ \]
\[\frac{37}{40} = \frac{37 \cdot 6}{40 \cdot 6} = \frac{222}{240}\]