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Finding the Fourth Proportional to 80,658.72, 120,909.11 and 45,137.39

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Solution

The fourth proportional to 80,658.72, 120,909.11 and 45,137.39 is: 67,661.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,658.72 : 120,909.11 = 45,137.39 : x
  2. Step 2: Convert to fraction form
    80,658.72/120,909.11 = 45,137.39/x
  3. Step 3: Cross multiply
    80,658.72x = 120,909.11 × 45,137.39
  4. Step 4: Simplify right side
    80,658.72x = 5,457,520,822.39
  5. Step 5: Solve for x
    x = 5,457,520,822.39/80,658.72
  6. Step 6: Final answer
    x = 67,661.88

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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.