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Finding the Fourth Proportional to 728.87, 1,092.42 and 381.71

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Solution

The fourth proportional to 728.87, 1,092.42 and 381.71 is: 572.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.87 : 1,092.42 = 381.71 : x
  2. Step 2: Convert to fraction form
    728.87/1,092.42 = 381.71/x
  3. Step 3: Cross multiply
    728.87x = 1,092.42 × 381.71
  4. Step 4: Simplify right side
    728.87x = 416,990.37
  5. Step 5: Solve for x
    x = 416,990.37/728.87
  6. Step 6: Final answer
    x = 572.11

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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.