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Finding the Fourth Proportional to 81,163.80, 121,745.70 and 61,480.80

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Solution

The fourth proportional to 81,163.80, 121,745.70 and 61,480.80 is: 92,221.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,163.80 : 121,745.70 = 61,480.80 : x
  2. Step 2: Convert to fraction form
    81,163.80/121,745.70 = 61,480.80/x
  3. Step 3: Cross multiply
    81,163.80x = 121,745.70 × 61,480.80
  4. Step 4: Simplify right side
    81,163.80x = 7,485,023,032.56
  5. Step 5: Solve for x
    x = 7,485,023,032.56/81,163.80
  6. Step 6: Final answer
    x = 92,221.20

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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.