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Finding the Fourth Proportional to 87,940.52, 131,909.70 and 21,380.60

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Solution

The fourth proportional to 87,940.52, 131,909.70 and 21,380.60 is: 32,070.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,940.52 : 131,909.70 = 21,380.60 : x
  2. Step 2: Convert to fraction form
    87,940.52/131,909.70 = 21,380.60/x
  3. Step 3: Cross multiply
    87,940.52x = 131,909.70 × 21,380.60
  4. Step 4: Simplify right side
    87,940.52x = 2,820,308,531.82
  5. Step 5: Solve for x
    x = 2,820,308,531.82/87,940.52
  6. Step 6: Final answer
    x = 32,070.64

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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.