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Finding the Fourth Proportional to 624.50, 861.87 and 391.58

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Solution

The fourth proportional to 624.50, 861.87 and 391.58 is: 540.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.50 : 861.87 = 391.58 : x
  2. Step 2: Convert to fraction form
    624.50/861.87 = 391.58/x
  3. Step 3: Cross multiply
    624.50x = 861.87 × 391.58
  4. Step 4: Simplify right side
    624.50x = 337,491.05
  5. Step 5: Solve for x
    x = 337,491.05/624.50
  6. Step 6: Final answer
    x = 540.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.