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Finding the Fourth Proportional to 624.53, 861.77 and 385.22

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Solution

The fourth proportional to 624.53, 861.77 and 385.22 is: 531.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.53 : 861.77 = 385.22 : x
  2. Step 2: Convert to fraction form
    624.53/861.77 = 385.22/x
  3. Step 3: Cross multiply
    624.53x = 861.77 × 385.22
  4. Step 4: Simplify right side
    624.53x = 331,967.69
  5. Step 5: Solve for x
    x = 331,967.69/624.53
  6. Step 6: Final answer
    x = 531.55

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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.