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Finding the Fourth Proportional to 18,644.88, 25,721.41 and 11,086.90

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Solution

The fourth proportional to 18,644.88, 25,721.41 and 11,086.90 is: 15,294.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,644.88 : 25,721.41 = 11,086.90 : x
  2. Step 2: Convert to fraction form
    18,644.88/25,721.41 = 11,086.90/x
  3. Step 3: Cross multiply
    18,644.88x = 25,721.41 × 11,086.90
  4. Step 4: Simplify right side
    18,644.88x = 285,170,700.53
  5. Step 5: Solve for x
    x = 285,170,700.53/18,644.88
  6. Step 6: Final answer
    x = 15,294.85

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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.