Finding the Fourth Proportional to 261.28, 391.91 and 107.17
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Solution
The fourth proportional to 261.28, 391.91 and 107.17 is: 160.75
Step by Step Solution
- Step 1: Write the proportion equation
261.28 : 391.91 = 107.17 : x - Step 2: Convert to fraction form
261.28/391.91 = 107.17/x - Step 3: Cross multiply
261.28x = 391.91 × 107.17 - Step 4: Simplify right side
261.28x = 42,000.99 - Step 5: Solve for x
x = 42,000.99/261.28 - Step 6: Final answer
x = 160.75
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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.