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Finding the Fourth Proportional to 87,879.92, 131,818.70 and 21,320.60

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Solution

The fourth proportional to 87,879.92, 131,818.70 and 21,320.60 is: 31,980.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,879.92 : 131,818.70 = 21,320.60 : x
  2. Step 2: Convert to fraction form
    87,879.92/131,818.70 = 21,320.60/x
  3. Step 3: Cross multiply
    87,879.92x = 131,818.70 × 21,320.60
  4. Step 4: Simplify right side
    87,879.92x = 2,810,453,169.43
  5. Step 5: Solve for x
    x = 2,810,453,169.43/87,879.92
  6. Step 6: Final answer
    x = 31,980.61

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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.