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Finding the Fourth Proportional to 728.15, 1,092.91 and 381.73

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Solution

The fourth proportional to 728.15, 1,092.91 and 381.73 is: 572.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.15 : 1,092.91 = 381.73 : x
  2. Step 2: Convert to fraction form
    728.15/1,092.91 = 381.73/x
  3. Step 3: Cross multiply
    728.15x = 1,092.91 × 381.73
  4. Step 4: Simplify right side
    728.15x = 417,196.53
  5. Step 5: Solve for x
    x = 417,196.53/728.15
  6. Step 6: Final answer
    x = 572.95

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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.