To multiply the fractions \( \frac{4}{5} \) and \( \frac{5}{3} \), you multiply the numerators and the denominators:
\[ \frac{4 \times 5}{5 \times 3} = \frac{20}{15} \]
Next, simplify \( \frac{20}{15} \) by finding the greatest common divisor (GCD) of 20 and 15, which is 5:
\[ \frac{20 \div 5}{15 \div 5} = \frac{4}{3} \]
So, \( \frac{4}{5} \times \frac{5}{3} = \frac{4}{3} \).