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Finding the Fourth Proportional to 87,384, 131,076.48 and 21,720

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Solution

The fourth proportional to 87,384, 131,076.48 and 21,720 is: 32,580.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,384 : 131,076.48 = 21,720 : x
  2. Step 2: Convert to fraction form
    87,384/131,076.48 = 21,720/x
  3. Step 3: Cross multiply
    87,384x = 131,076.48 × 21,720
  4. Step 4: Simplify right side
    87,384x = 2,846,981,145.60
  5. Step 5: Solve for x
    x = 2,846,981,145.60/87,384
  6. Step 6: Final answer
    x = 32,580.12

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.