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Finding the Fourth Proportional to 396,431.62, 547,079.67 and 215,145.11

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Solution

The fourth proportional to 396,431.62, 547,079.67 and 215,145.11 is: 296,902.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,431.62 : 547,079.67 = 215,145.11 : x
  2. Step 2: Convert to fraction form
    396,431.62/547,079.67 = 215,145.11/x
  3. Step 3: Cross multiply
    396,431.62x = 547,079.67 × 215,145.11
  4. Step 4: Simplify right side
    396,431.62x = 117,701,517,148.61
  5. Step 5: Solve for x
    x = 117,701,517,148.61/396,431.62
  6. Step 6: Final answer
    x = 296,902.45

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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.