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Finding the Fourth Proportional to 396,908.78, 547,731.92 and 215,619.26

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Solution

The fourth proportional to 396,908.78, 547,731.92 and 215,619.26 is: 297,553.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,908.78 : 547,731.92 = 215,619.26 : x
  2. Step 2: Convert to fraction form
    396,908.78/547,731.92 = 215,619.26/x
  3. Step 3: Cross multiply
    396,908.78x = 547,731.92 × 215,619.26
  4. Step 4: Simplify right side
    396,908.78x = 118,101,548,530.12
  5. Step 5: Solve for x
    x = 118,101,548,530.12/396,908.78
  6. Step 6: Final answer
    x = 297,553.38

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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.