As per the ratio proportion concept, the actual length of the second wall is 43.2 feet.
What is ratio proportion?
Ratio proportion is an equation where two sides of it are equal. A ratio or proportion maintains the equality between two fractions.
Given, a 12 feet wall measure 2.5 inches on a scale drawing.
A second wall measures 9 inches on that scale drawing.
Let, the actual length of the drawing is x.
Therefore, as per the ratio proportion, we can write:
12 : 2.5 = x : 9
⇒ 12/2.5 = x/9
⇒ x = (12 × 9)/2.5
⇒ x = 43.2
Therefore, the actual length of the second wall is 43.2 feet.
Learn more about the ratio proportion here: brainly.com/question/20341183
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