Let's interpret the equation \( \frac{x}{8} = 3 \cdot \frac{x + 4}{2} \).
To identify which expression represents a product, we can break down the equation:
- The left side, \( \frac{x}{8} \), is a fraction and does not represent a product.
- The right side has two parts: \( 3 \) and \( \frac{x + 4}{2} \).
- The \( 3 \) and \( \frac{x + 4}{2} \) are multiplied together (indicated by the multiplication dot or by placing them next to each other without any operation sign).
Therefore, the expression \( 3 \cdot \frac{x + 4}{2} \) includes the product \( 3 \) and \( \frac{x + 4}{2} \) together, which forms the complete multiplication.
Conclusively, the part of the equation that represents a product is: \[ 3 \cdot \frac{x + 4}{2} \]