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Finding the Fourth Proportional to 18,691.26, 27,996.69 and 8,815.74

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Solution

The fourth proportional to 18,691.26, 27,996.69 and 8,815.74 is: 13,204.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.26 : 27,996.69 = 8,815.74 : x
  2. Step 2: Convert to fraction form
    18,691.26/27,996.69 = 8,815.74/x
  3. Step 3: Cross multiply
    18,691.26x = 27,996.69 × 8,815.74
  4. Step 4: Simplify right side
    18,691.26x = 246,811,539.90
  5. Step 5: Solve for x
    x = 246,811,539.90/18,691.26
  6. Step 6: Final answer
    x = 13,204.65

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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.