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Finding the Fourth Proportional to 80,695.90, 120,917.31 and 51,051.11

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Solution

The fourth proportional to 80,695.90, 120,917.31 and 51,051.11 is: 76,496.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,695.90 : 120,917.31 = 51,051.11 : x
  2. Step 2: Convert to fraction form
    80,695.90/120,917.31 = 51,051.11/x
  3. Step 3: Cross multiply
    80,695.90x = 120,917.31 × 51,051.11
  4. Step 4: Simplify right side
    80,695.90x = 6,172,962,777.85
  5. Step 5: Solve for x
    x = 6,172,962,777.85/80,695.90
  6. Step 6: Final answer
    x = 76,496.61

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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.