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Finding the Fourth Proportional to 396,508.35, 547,181.90 and 215,220.43

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Solution

The fourth proportional to 396,508.35, 547,181.90 and 215,220.43 is: 297,004.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,508.35 : 547,181.90 = 215,220.43 : x
  2. Step 2: Convert to fraction form
    396,508.35/547,181.90 = 215,220.43/x
  3. Step 3: Cross multiply
    396,508.35x = 547,181.90 × 215,220.43
  4. Step 4: Simplify right side
    396,508.35x = 117,764,723,806.22
  5. Step 5: Solve for x
    x = 117,764,723,806.22/396,508.35
  6. Step 6: Final answer
    x = 297,004.40

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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.