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Finding the Fourth Proportional to 21,791.52, 32,682.42 and 8,640.36

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Solution

The fourth proportional to 21,791.52, 32,682.42 and 8,640.36 is: 12,958.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,791.52 : 32,682.42 = 8,640.36 : x
  2. Step 2: Convert to fraction form
    21,791.52/32,682.42 = 8,640.36/x
  3. Step 3: Cross multiply
    21,791.52x = 32,682.42 × 8,640.36
  4. Step 4: Simplify right side
    21,791.52x = 282,387,874.47
  5. Step 5: Solve for x
    x = 282,387,874.47/21,791.52
  6. Step 6: Final answer
    x = 12,958.61

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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.