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Finding the Fourth Proportional to 80,640.39, 120,978.72 and 27,329.34

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Solution

The fourth proportional to 80,640.39, 120,978.72 and 27,329.34 is: 41,000.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,640.39 : 120,978.72 = 27,329.34 : x
  2. Step 2: Convert to fraction form
    80,640.39/120,978.72 = 27,329.34/x
  3. Step 3: Cross multiply
    80,640.39x = 120,978.72 × 27,329.34
  4. Step 4: Simplify right side
    80,640.39x = 3,306,268,571.64
  5. Step 5: Solve for x
    x = 3,306,268,571.64/80,640.39
  6. Step 6: Final answer
    x = 41,000.16

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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.