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Finding the Fourth Proportional to 396,506.61, 547,179.50 and 215,218.49

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Solution

The fourth proportional to 396,506.61, 547,179.50 and 215,218.49 is: 297,001.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,506.61 : 547,179.50 = 215,218.49 : x
  2. Step 2: Convert to fraction form
    396,506.61/547,179.50 = 215,218.49/x
  3. Step 3: Cross multiply
    396,506.61x = 547,179.50 × 215,218.49
  4. Step 4: Simplify right side
    396,506.61x = 117,763,143,551.10
  5. Step 5: Solve for x
    x = 117,763,143,551.10/396,506.61
  6. Step 6: Final answer
    x = 297,001.72

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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.