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Finding the Fourth Proportional to 396,440, 547,087.48 and 215,151.89

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Solution

The fourth proportional to 396,440, 547,087.48 and 215,151.89 is: 296,909.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,440 : 547,087.48 = 215,151.89 : x
  2. Step 2: Convert to fraction form
    396,440/547,087.48 = 215,151.89/x
  3. Step 3: Cross multiply
    396,440x = 547,087.48 × 215,151.89
  4. Step 4: Simplify right side
    396,440x = 117,706,902,581.90
  5. Step 5: Solve for x
    x = 117,706,902,581.90/396,440
  6. Step 6: Final answer
    x = 296,909.75

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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.