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Finding the Fourth Proportional to 844.20, 1,265.31 and 381.44

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Solution

The fourth proportional to 844.20, 1,265.31 and 381.44 is: 571.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    844.20 : 1,265.31 = 381.44 : x
  2. Step 2: Convert to fraction form
    844.20/1,265.31 = 381.44/x
  3. Step 3: Cross multiply
    844.20x = 1,265.31 × 381.44
  4. Step 4: Simplify right side
    844.20x = 482,639.85
  5. Step 5: Solve for x
    x = 482,639.85/844.20
  6. Step 6: Final answer
    x = 571.71

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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.