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Finding the Fourth Proportional to 723, 1,084.92 and 381

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Solution

The fourth proportional to 723, 1,084.92 and 381 is: 571.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    723 : 1,084.92 = 381 : x
  2. Step 2: Convert to fraction form
    723/1,084.92 = 381/x
  3. Step 3: Cross multiply
    723x = 1,084.92 × 381
  4. Step 4: Simplify right side
    723x = 413,354.52
  5. Step 5: Solve for x
    x = 413,354.52/723
  6. Step 6: Final answer
    x = 571.72

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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.