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Finding the Fourth Proportional to 81,469.80, 122,301.90 and 45,959.40

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Solution

The fourth proportional to 81,469.80, 122,301.90 and 45,959.40 is: 68,993.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,469.80 : 122,301.90 = 45,959.40 : x
  2. Step 2: Convert to fraction form
    81,469.80/122,301.90 = 45,959.40/x
  3. Step 3: Cross multiply
    81,469.80x = 122,301.90 × 45,959.40
  4. Step 4: Simplify right side
    81,469.80x = 5,620,921,942.86
  5. Step 5: Solve for x
    x = 5,620,921,942.86/81,469.80
  6. Step 6: Final answer
    x = 68,993.93

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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.