\[\boxed{\mathbf{257\ (257)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\frac{1}{4} < \frac{x}{48} < \frac{1}{3}\]
\[\frac{12}{48} < \frac{x}{48} < \frac{16}{48}\]
\[\frac{1}{4} = \frac{12}{48};\ \ \ \ \ \frac{1}{3} = \frac{16}{48}\text{\ \ }\]
\[x = 13;14;15.\]
\[Ответ:\ \frac{13}{48};\ \frac{14}{48};\frac{15}{48}.\]
\[\boxed{\mathbf{257}\mathbf{.}}\]
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