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Finding the Fourth Proportional to 87,211.20, 130,816.80 and 82,027.20

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Solution

The fourth proportional to 87,211.20, 130,816.80 and 82,027.20 is: 123,040.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,211.20 : 130,816.80 = 82,027.20 : x
  2. Step 2: Convert to fraction form
    87,211.20/130,816.80 = 82,027.20/x
  3. Step 3: Cross multiply
    87,211.20x = 130,816.80 × 82,027.20
  4. Step 4: Simplify right side
    87,211.20x = 10,730,535,816.96
  5. Step 5: Solve for x
    x = 10,730,535,816.96/87,211.20
  6. Step 6: Final answer
    x = 123,040.80

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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.