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Finding the Fourth Proportional to 80,616.72, 120,620.88 and 72,431.52

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Solution

The fourth proportional to 80,616.72, 120,620.88 and 72,431.52 is: 108,373.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,616.72 : 120,620.88 = 72,431.52 : x
  2. Step 2: Convert to fraction form
    80,616.72/120,620.88 = 72,431.52/x
  3. Step 3: Cross multiply
    80,616.72x = 120,620.88 × 72,431.52
  4. Step 4: Simplify right side
    80,616.72x = 8,736,753,682.14
  5. Step 5: Solve for x
    x = 8,736,753,682.14/80,616.72
  6. Step 6: Final answer
    x = 108,373.97

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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.