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Finding the Fourth Proportional to 72,704.80, 108,999.60 and 39,872.80

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Solution

The fourth proportional to 72,704.80, 108,999.60 and 39,872.80 is: 59,777.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,704.80 : 108,999.60 = 39,872.80 : x
  2. Step 2: Convert to fraction form
    72,704.80/108,999.60 = 39,872.80/x
  3. Step 3: Cross multiply
    72,704.80x = 108,999.60 × 39,872.80
  4. Step 4: Simplify right side
    72,704.80x = 4,346,119,250.88
  5. Step 5: Solve for x
    x = 4,346,119,250.88/72,704.80
  6. Step 6: Final answer
    x = 59,777.61

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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.