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Finding the Fourth Proportional to 624.65, 861.50 and 391.37

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Solution

The fourth proportional to 624.65, 861.50 and 391.37 is: 539.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.65 : 861.50 = 391.37 : x
  2. Step 2: Convert to fraction form
    624.65/861.50 = 391.37/x
  3. Step 3: Cross multiply
    624.65x = 861.50 × 391.37
  4. Step 4: Simplify right side
    624.65x = 337,161.93
  5. Step 5: Solve for x
    x = 337,161.93/624.65
  6. Step 6: Final answer
    x = 539.77

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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.