Final answer:
To find the length of the wall represented by a line that is 3 7/8 inches long on the blueprint, we can use the scale conversion. The length of the wall is 15 1/2 feet.
Step-by-step explanation:
To find the length of the wall represented by a line that is 3 7/8 inches long on the blueprint, we need to use the scale conversion.
The given scale is 1 inch corresponds to 4 feet.
So, we can set up a proportion:
1 inch − 4 feet
3 7/8 inches − x feet
To solve for x, we can cross-multiply:
1 × x = 4 × 3 7/8
Multiply 4 by the whole number 3 and then add the product to the result of 4 multiplied by the fractional part 7/8.
x = 12 + 28/8
x = 12 + 3 1/2
x = 15 1/2 feet
Therefore, the length of the wall represented by a line that is 3 7/8 inches long on the blueprint is 15 1/2 feet.