Finding the Fourth Proportional to 76.08, 113.28 and 74.40
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Solution
The fourth proportional to 76.08, 113.28 and 74.40 is: 110.78
Step by Step Solution
- Step 1: Write the proportion equation
76.08 : 113.28 = 74.40 : x - Step 2: Convert to fraction form
76.08/113.28 = 74.40/x - Step 3: Cross multiply
76.08x = 113.28 × 74.40 - Step 4: Simplify right side
76.08x = 8,428.03 - Step 5: Solve for x
x = 8,428.03/76.08 - Step 6: Final answer
x = 110.78
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.