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Finding the Fourth Proportional to 624.75, 862.22 and 391.83

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Solution

The fourth proportional to 624.75, 862.22 and 391.83 is: 540.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.75 : 862.22 = 391.83 : x
  2. Step 2: Convert to fraction form
    624.75/862.22 = 391.83/x
  3. Step 3: Cross multiply
    624.75x = 862.22 × 391.83
  4. Step 4: Simplify right side
    624.75x = 337,841.70
  5. Step 5: Solve for x
    x = 337,841.70/624.75
  6. Step 6: Final answer
    x = 540.76

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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.