Finding the Fourth Proportional to 81.61, 122.36 and 57.26
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Solution
The fourth proportional to 81.61, 122.36 and 57.26 is: 85.85
Step by Step Solution
- Step 1: Write the proportion equation
81.61 : 122.36 = 57.26 : x - Step 2: Convert to fraction form
81.61/122.36 = 57.26/x - Step 3: Cross multiply
81.61x = 122.36 × 57.26 - Step 4: Simplify right side
81.61x = 7,005.99 - Step 5: Solve for x
x = 7,005.99/81.61 - Step 6: Final answer
x = 85.85
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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.