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Finding the Fourth Proportional to 81,945.60, 122,745.60 and 68,121.60

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Solution

The fourth proportional to 81,945.60, 122,745.60 and 68,121.60 is: 102,038.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,945.60 : 122,745.60 = 68,121.60 : x
  2. Step 2: Convert to fraction form
    81,945.60/122,745.60 = 68,121.60/x
  3. Step 3: Cross multiply
    81,945.60x = 122,745.60 × 68,121.60
  4. Step 4: Simplify right side
    81,945.60x = 8,361,626,664.96
  5. Step 5: Solve for x
    x = 8,361,626,664.96/81,945.60
  6. Step 6: Final answer
    x = 102,038.75

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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.