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Finding the Fourth Proportional to 396,990.82, 547,849.36 and 215,703.21

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Solution

The fourth proportional to 396,990.82, 547,849.36 and 215,703.21 is: 297,671.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,990.82 : 547,849.36 = 215,703.21 : x
  2. Step 2: Convert to fraction form
    396,990.82/547,849.36 = 215,703.21/x
  3. Step 3: Cross multiply
    396,990.82x = 547,849.36 × 215,703.21
  4. Step 4: Simplify right side
    396,990.82x = 118,172,864,469.93
  5. Step 5: Solve for x
    x = 118,172,864,469.93/396,990.82
  6. Step 6: Final answer
    x = 297,671.53

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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.