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Finding the Fourth Proportional to 396,407.84, 547,043.17 and 215,119.77

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Solution

The fourth proportional to 396,407.84, 547,043.17 and 215,119.77 is: 296,865.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,407.84 : 547,043.17 = 215,119.77 : x
  2. Step 2: Convert to fraction form
    396,407.84/547,043.17 = 215,119.77/x
  3. Step 3: Cross multiply
    396,407.84x = 547,043.17 × 215,119.77
  4. Step 4: Simplify right side
    396,407.84x = 117,679,800,910.47
  5. Step 5: Solve for x
    x = 117,679,800,910.47/396,407.84
  6. Step 6: Final answer
    x = 296,865.47

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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.