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Finding the Fourth Proportional to 81,401.20, 122,101.80 and 68,279.20

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Solution

The fourth proportional to 81,401.20, 122,101.80 and 68,279.20 is: 102,418.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,401.20 : 122,101.80 = 68,279.20 : x
  2. Step 2: Convert to fraction form
    81,401.20/122,101.80 = 68,279.20/x
  3. Step 3: Cross multiply
    81,401.20x = 122,101.80 × 68,279.20
  4. Step 4: Simplify right side
    81,401.20x = 8,337,013,222.56
  5. Step 5: Solve for x
    x = 8,337,013,222.56/81,401.20
  6. Step 6: Final answer
    x = 102,418.80

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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.