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Finding the Fourth Proportional to 87,871.20, 131,806.80 and 84,760.80

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Solution

The fourth proportional to 87,871.20, 131,806.80 and 84,760.80 is: 127,141.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,871.20 : 131,806.80 = 84,760.80 : x
  2. Step 2: Convert to fraction form
    87,871.20/131,806.80 = 84,760.80/x
  3. Step 3: Cross multiply
    87,871.20x = 131,806.80 × 84,760.80
  4. Step 4: Simplify right side
    87,871.20x = 11,172,049,813.44
  5. Step 5: Solve for x
    x = 11,172,049,813.44/87,871.20
  6. Step 6: Final answer
    x = 127,141.20

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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.