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Finding the Fourth Proportional to 396,987.57, 547,836.21 and 215,702.28

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Solution

The fourth proportional to 396,987.57, 547,836.21 and 215,702.28 is: 297,665.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,987.57 : 547,836.21 = 215,702.28 : x
  2. Step 2: Convert to fraction form
    396,987.57/547,836.21 = 215,702.28/x
  3. Step 3: Cross multiply
    396,987.57x = 547,836.21 × 215,702.28
  4. Step 4: Simplify right side
    396,987.57x = 118,169,519,563.56
  5. Step 5: Solve for x
    x = 118,169,519,563.56/396,987.57
  6. Step 6: Final answer
    x = 297,665.54

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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.