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Finding the Fourth Proportional to 81,629.40, 122,415.30 and 29,040.60

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Solution

The fourth proportional to 81,629.40, 122,415.30 and 29,040.60 is: 43,550.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,629.40 : 122,415.30 = 29,040.60 : x
  2. Step 2: Convert to fraction form
    81,629.40/122,415.30 = 29,040.60/x
  3. Step 3: Cross multiply
    81,629.40x = 122,415.30 × 29,040.60
  4. Step 4: Simplify right side
    81,629.40x = 3,555,013,761.18
  5. Step 5: Solve for x
    x = 3,555,013,761.18/81,629.40
  6. Step 6: Final answer
    x = 43,550.65

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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.