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Finding the Fourth Proportional to 396,469.68, 547,128.69 and 215,181.60

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Solution

The fourth proportional to 396,469.68, 547,128.69 and 215,181.60 is: 296,950.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,469.68 : 547,128.69 = 215,181.60 : x
  2. Step 2: Convert to fraction form
    396,469.68/547,128.69 = 215,181.60/x
  3. Step 3: Cross multiply
    396,469.68x = 547,128.69 × 215,181.60
  4. Step 4: Simplify right side
    396,469.68x = 117,732,026,920.10
  5. Step 5: Solve for x
    x = 117,732,026,920.10/396,469.68
  6. Step 6: Final answer
    x = 296,950.90

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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.