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Finding the Fourth Proportional to 76,979.80, 115,440.90 and 27,040.60

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Solution

The fourth proportional to 76,979.80, 115,440.90 and 27,040.60 is: 40,550.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,979.80 : 115,440.90 = 27,040.60 : x
  2. Step 2: Convert to fraction form
    76,979.80/115,440.90 = 27,040.60/x
  3. Step 3: Cross multiply
    76,979.80x = 115,440.90 × 27,040.60
  4. Step 4: Simplify right side
    76,979.80x = 3,121,591,200.54
  5. Step 5: Solve for x
    x = 3,121,591,200.54/76,979.80
  6. Step 6: Final answer
    x = 40,550.78

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1.5x scale

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.