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Finding the Fourth Proportional to 624.31, 861.50 and 358.76

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Solution

The fourth proportional to 624.31, 861.50 and 358.76 is: 495.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.31 : 861.50 = 358.76 : x
  2. Step 2: Convert to fraction form
    624.31/861.50 = 358.76/x
  3. Step 3: Cross multiply
    624.31x = 861.50 × 358.76
  4. Step 4: Simplify right side
    624.31x = 309,074.79
  5. Step 5: Solve for x
    x = 309,074.79/624.31
  6. Step 6: Final answer
    x = 495.07

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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.