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Finding the Fourth Proportional to 18,691.97, 28,078.65 and 11,299.91

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Solution

The fourth proportional to 18,691.97, 28,078.65 and 11,299.91 is: 16,974.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.97 : 28,078.65 = 11,299.91 : x
  2. Step 2: Convert to fraction form
    18,691.97/28,078.65 = 11,299.91/x
  3. Step 3: Cross multiply
    18,691.97x = 28,078.65 × 11,299.91
  4. Step 4: Simplify right side
    18,691.97x = 317,286,077.53
  5. Step 5: Solve for x
    x = 317,286,077.53/18,691.97
  6. Step 6: Final answer
    x = 16,974.46

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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.