4:16 7

$${\frac{4}{7}} : 16 = {\frac{4}{7}} \cdot {\frac{1}{16}} = {\frac{4}{7 \cdot 16}} = {\frac{4}{7 \cdot 4 \cdot 4}} = {\frac{1}{7 \cdot 4}} = {\frac{1}{28}}$$

Ответ: $$\frac{1}{28}$$