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Finding the Fourth Proportional to 765.92, 1,147.92 and 381.28

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Solution

The fourth proportional to 765.92, 1,147.92 and 381.28 is: 571.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.92 : 1,147.92 = 381.28 : x
  2. Step 2: Convert to fraction form
    765.92/1,147.92 = 381.28/x
  3. Step 3: Cross multiply
    765.92x = 1,147.92 × 381.28
  4. Step 4: Simplify right side
    765.92x = 437,678.94
  5. Step 5: Solve for x
    x = 437,678.94/765.92
  6. Step 6: Final answer
    x = 571.44

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Double scale
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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.