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Finding the Fourth Proportional to 18,604.38, 27,882.81 and 8,721.90

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Solution

The fourth proportional to 18,604.38, 27,882.81 and 8,721.90 is: 13,071.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,604.38 : 27,882.81 = 8,721.90 : x
  2. Step 2: Convert to fraction form
    18,604.38/27,882.81 = 8,721.90/x
  3. Step 3: Cross multiply
    18,604.38x = 27,882.81 × 8,721.90
  4. Step 4: Simplify right side
    18,604.38x = 243,191,080.54
  5. Step 5: Solve for x
    x = 243,191,080.54/18,604.38
  6. Step 6: Final answer
    x = 13,071.71

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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.