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Finding the Fourth Proportional to 624.27, 861.05 and 447.39

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Solution

The fourth proportional to 624.27, 861.05 and 447.39 is: 617.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.27 : 861.05 = 447.39 : x
  2. Step 2: Convert to fraction form
    624.27/861.05 = 447.39/x
  3. Step 3: Cross multiply
    624.27x = 861.05 × 447.39
  4. Step 4: Simplify right side
    624.27x = 385,222.92
  5. Step 5: Solve for x
    x = 385,222.92/624.27
  6. Step 6: Final answer
    x = 617.08

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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.