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Finding the Fourth Proportional to 396,391.64, 547,021.95 and 215,103.61

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Solution

The fourth proportional to 396,391.64, 547,021.95 and 215,103.61 is: 296,843.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,391.64 : 547,021.95 = 215,103.61 : x
  2. Step 2: Convert to fraction form
    396,391.64/547,021.95 = 215,103.61/x
  3. Step 3: Cross multiply
    396,391.64x = 547,021.95 × 215,103.61
  4. Step 4: Simplify right side
    396,391.64x = 117,666,394,826.69
  5. Step 5: Solve for x
    x = 117,666,394,826.69/396,391.64
  6. Step 6: Final answer
    x = 296,843.78

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1.5x scale

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.