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Finding the Fourth Proportional to 81,791.28, 122,686.88 and 26,387.28

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Solution

The fourth proportional to 81,791.28, 122,686.88 and 26,387.28 is: 39,580.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,791.28 : 122,686.88 = 26,387.28 : x
  2. Step 2: Convert to fraction form
    81,791.28/122,686.88 = 26,387.28/x
  3. Step 3: Cross multiply
    81,791.28x = 122,686.88 × 26,387.28
  4. Step 4: Simplify right side
    81,791.28x = 3,237,373,054.89
  5. Step 5: Solve for x
    x = 3,237,373,054.89/81,791.28
  6. Step 6: Final answer
    x = 39,580.91

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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.