4) \(\frac{4}{9}\cdot2\frac{3}{4}\)

\(2\frac{3}{4}=\frac{11}{4}\).

\(\frac{4}{9}\cdot\frac{11}{4}=\frac{11}{9}=1\frac{2}{9}\).

Ответ: \(1\frac{2}{9}\)