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Finding the Fourth Proportional to 8,691.14, 13,019.09 and 6,939.11

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Solution

The fourth proportional to 8,691.14, 13,019.09 and 6,939.11 is: 10,394.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.14 : 13,019.09 = 6,939.11 : x
  2. Step 2: Convert to fraction form
    8,691.14/13,019.09 = 6,939.11/x
  3. Step 3: Cross multiply
    8,691.14x = 13,019.09 × 6,939.11
  4. Step 4: Simplify right side
    8,691.14x = 90,340,897.61
  5. Step 5: Solve for x
    x = 90,340,897.61/8,691.14
  6. Step 6: Final answer
    x = 10,394.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.