Finding the Fourth Proportional to 81.54, 122.29 and 51.11
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Solution
The fourth proportional to 81.54, 122.29 and 51.11 is: 76.65
Step by Step Solution
- Step 1: Write the proportion equation
81.54 : 122.29 = 51.11 : x - Step 2: Convert to fraction form
81.54/122.29 = 51.11/x - Step 3: Cross multiply
81.54x = 122.29 × 51.11 - Step 4: Simplify right side
81.54x = 6,250.24 - Step 5: Solve for x
x = 6,250.24/81.54 - Step 6: Final answer
x = 76.65
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.