#### Solution By Steps***Step 1: Identify the Proportion***A proportion is an equation stating that two ratios are equal. In this case, we have:$\frac{a}{b} = \frac{c}{d}$***Step 2: Evaluate Vincent's Proportion***Vincent's proportion is:$\frac{3}{5} = \frac{9}{15}$***Step 3: Simplify the Ratios***To simplify the ratios, we can reduce both sides to their simplest form:$\frac{3}{5} = \frac{3}{5}$***Step 4: Conclusion***Since after simplification, both sides of the proportion are equal, Vincent's proportion is correct.#### Final AnswerVincent's proportion $\frac{3}{5} = \frac{9}{15}$ is correct as both sides simplify to $\frac{3}{5}$.
