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Finding the Fourth Proportional to 80,709.89, 121,067.90 and 41,220.88

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Solution

The fourth proportional to 80,709.89, 121,067.90 and 41,220.88 is: 61,832.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,709.89 : 121,067.90 = 41,220.88 : x
  2. Step 2: Convert to fraction form
    80,709.89/121,067.90 = 41,220.88/x
  3. Step 3: Cross multiply
    80,709.89x = 121,067.90 × 41,220.88
  4. Step 4: Simplify right side
    80,709.89x = 4,990,525,178.13
  5. Step 5: Solve for x
    x = 4,990,525,178.13/80,709.89
  6. Step 6: Final answer
    x = 61,832.88

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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.