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Finding the Fourth Proportional to 624.29, 861.62 and 372.20

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Solution

The fourth proportional to 624.29, 861.62 and 372.20 is: 513.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.29 : 861.62 = 372.20 : x
  2. Step 2: Convert to fraction form
    624.29/861.62 = 372.20/x
  3. Step 3: Cross multiply
    624.29x = 861.62 × 372.20
  4. Step 4: Simplify right side
    624.29x = 320,688.79
  5. Step 5: Solve for x
    x = 320,688.79/624.29
  6. Step 6: Final answer
    x = 513.69

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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.