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Finding the Fourth Proportional to 80,509.90, 120,786.45 and 71,805.10

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Solution

The fourth proportional to 80,509.90, 120,786.45 and 71,805.10 is: 107,726.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,509.90 : 120,786.45 = 71,805.10 : x
  2. Step 2: Convert to fraction form
    80,509.90/120,786.45 = 71,805.10/x
  3. Step 3: Cross multiply
    80,509.90x = 120,786.45 × 71,805.10
  4. Step 4: Simplify right side
    80,509.90x = 8,673,083,120.90
  5. Step 5: Solve for x
    x = 8,673,083,120.90/80,509.90
  6. Step 6: Final answer
    x = 107,726.91

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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.