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Finding the Fourth Proportional to 624.26, 861.08 and 391.52

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Solution

The fourth proportional to 624.26, 861.08 and 391.52 is: 540.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.26 : 861.08 = 391.52 : x
  2. Step 2: Convert to fraction form
    624.26/861.08 = 391.52/x
  3. Step 3: Cross multiply
    624.26x = 861.08 × 391.52
  4. Step 4: Simplify right side
    624.26x = 337,130.04
  5. Step 5: Solve for x
    x = 337,130.04/624.26
  6. Step 6: Final answer
    x = 540.05

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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.