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Finding the Fourth Proportional to 87,960.60, 131,940.90 and 21,400.20

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Solution

The fourth proportional to 87,960.60, 131,940.90 and 21,400.20 is: 32,100.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,960.60 : 131,940.90 = 21,400.20 : x
  2. Step 2: Convert to fraction form
    87,960.60/131,940.90 = 21,400.20/x
  3. Step 3: Cross multiply
    87,960.60x = 131,940.90 × 21,400.20
  4. Step 4: Simplify right side
    87,960.60x = 2,823,561,648.18
  5. Step 5: Solve for x
    x = 2,823,561,648.18/87,960.60
  6. Step 6: Final answer
    x = 32,100.30

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1.5x scale

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.