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Finding the Fourth Proportional to 87,130.20, 130,695.30 and 67,422.90

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Solution

The fourth proportional to 87,130.20, 130,695.30 and 67,422.90 is: 101,134.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,130.20 : 130,695.30 = 67,422.90 : x
  2. Step 2: Convert to fraction form
    87,130.20/130,695.30 = 67,422.90/x
  3. Step 3: Cross multiply
    87,130.20x = 130,695.30 × 67,422.90
  4. Step 4: Simplify right side
    87,130.20x = 8,811,856,142.37
  5. Step 5: Solve for x
    x = 8,811,856,142.37/87,130.20
  6. Step 6: Final answer
    x = 101,134.35

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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.