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Finding the Fourth Proportional to 396,628, 547,331.18 and 215,335.80

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Solution

The fourth proportional to 396,628, 547,331.18 and 215,335.80 is: 297,155.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,628 : 547,331.18 = 215,335.80 : x
  2. Step 2: Convert to fraction form
    396,628/547,331.18 = 215,335.80/x
  3. Step 3: Cross multiply
    396,628x = 547,331.18 × 215,335.80
  4. Step 4: Simplify right side
    396,628x = 117,859,997,510.24
  5. Step 5: Solve for x
    x = 117,859,997,510.24/396,628
  6. Step 6: Final answer
    x = 297,155.01

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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.