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Finding the Fourth Proportional to 72,761.20, 108,923.10 and 43,163.80

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Solution

The fourth proportional to 72,761.20, 108,923.10 and 43,163.80 is: 64,615.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,761.20 : 108,923.10 = 43,163.80 : x
  2. Step 2: Convert to fraction form
    72,761.20/108,923.10 = 43,163.80/x
  3. Step 3: Cross multiply
    72,761.20x = 108,923.10 × 43,163.80
  4. Step 4: Simplify right side
    72,761.20x = 4,701,534,903.78
  5. Step 5: Solve for x
    x = 4,701,534,903.78/72,761.20
  6. Step 6: Final answer
    x = 64,615.96

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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.