Final answer:
To complete the proportion, the missing number that represents the number of stamps on a certain number of sheets is 1.
Step-by-step explanation:
To complete the proportion, we need to find the missing number that represents the number of stamps on a certain number of sheets. We can set up the proportion as follows:
40 stamps / 4 sheets = 10 stamps / x sheets
To find the missing number, we can cross-multiply and solve for x:
40 * x = 4 * 10
x = 4 * 10 / 40
x = 1
Therefore, the missing number is 1. There are 10 stamps on 1 sheet.
Learn more about missing number in a proportion