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Finding the Fourth Proportional to 396,620.78, 547,336.86 and 215,332.52

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Solution

The fourth proportional to 396,620.78, 547,336.86 and 215,332.52 is: 297,158.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,620.78 : 547,336.86 = 215,332.52 : x
  2. Step 2: Convert to fraction form
    396,620.78/547,336.86 = 215,332.52/x
  3. Step 3: Cross multiply
    396,620.78x = 547,336.86 × 215,332.52
  4. Step 4: Simplify right side
    396,620.78x = 117,859,425,352.69
  5. Step 5: Solve for x
    x = 117,859,425,352.69/396,620.78
  6. Step 6: Final answer
    x = 297,158.98

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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.