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Finding the Fourth Proportional to 20,139, 27,791.82 and 11,753.88

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Solution

The fourth proportional to 20,139, 27,791.82 and 11,753.88 is: 16,220.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139 : 27,791.82 = 11,753.88 : x
  2. Step 2: Convert to fraction form
    20,139/27,791.82 = 11,753.88/x
  3. Step 3: Cross multiply
    20,139x = 27,791.82 × 11,753.88
  4. Step 4: Simplify right side
    20,139x = 326,661,717.26
  5. Step 5: Solve for x
    x = 326,661,717.26/20,139
  6. Step 6: Final answer
    x = 16,220.35

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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.