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Finding the Fourth Proportional to 396,513, 547,179.28 and 215,225.28

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Solution

The fourth proportional to 396,513, 547,179.28 and 215,225.28 is: 297,006.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,513 : 547,179.28 = 215,225.28 : x
  2. Step 2: Convert to fraction form
    396,513/547,179.28 = 215,225.28/x
  3. Step 3: Cross multiply
    396,513x = 547,179.28 × 215,225.28
  4. Step 4: Simplify right side
    396,513x = 117,766,813,748.20
  5. Step 5: Solve for x
    x = 117,766,813,748.20/396,513
  6. Step 6: Final answer
    x = 297,006.19

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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.