5. 19 is $50 \%$ of what number

Step 1 ：The question is asking for a number such that 50% of it is equal to 19. This can be represented by the equation \(0.5 * x = 19\), where x is the number we are trying to find.

Step 2 ：To solve for x, we can divide both sides of the equation by 0.5.

Step 3 ：\(x = 38.0\)

Step 4 ：Final Answer: The number is \(\boxed{38}\)