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Finding the Fourth Proportional to 87,111.80, 130,764.90 and 81,401.30

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Solution

The fourth proportional to 87,111.80, 130,764.90 and 81,401.30 is: 122,192.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,111.80 : 130,764.90 = 81,401.30 : x
  2. Step 2: Convert to fraction form
    87,111.80/130,764.90 = 81,401.30/x
  3. Step 3: Cross multiply
    87,111.80x = 130,764.90 × 81,401.30
  4. Step 4: Simplify right side
    87,111.80x = 10,644,432,854.37
  5. Step 5: Solve for x
    x = 10,644,432,854.37/87,111.80
  6. Step 6: Final answer
    x = 122,192.78

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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.