Home / 81,489.40-122,161.20-53,422.90

Finding the Fourth Proportional to 81,489.40, 122,161.20 and 53,422.90

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Solution

The fourth proportional to 81,489.40, 122,161.20 and 53,422.90 is: 80,086.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,489.40 : 122,161.20 = 53,422.90 : x
  2. Step 2: Convert to fraction form
    81,489.40/122,161.20 = 53,422.90/x
  3. Step 3: Cross multiply
    81,489.40x = 122,161.20 × 53,422.90
  4. Step 4: Simplify right side
    81,489.40x = 6,526,205,571.48
  5. Step 5: Solve for x
    x = 6,526,205,571.48/81,489.40
  6. Step 6: Final answer
    x = 80,086.56

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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.