5 15 23 46

\[ \frac{5}{23} \div \frac{15}{46} = \frac{5}{23} \cdot \frac{46}{15} = \frac{5 \cdot 46}{23 \cdot 15} = \frac{230}{345} = \frac{2}{3} \]

Ответ: \(\frac{2}{3}\)