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Finding the Fourth Proportional to 207,906.20, 311,640.60 and 81,497.60

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Solution

The fourth proportional to 207,906.20, 311,640.60 and 81,497.60 is: 122,160.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,906.20 : 311,640.60 = 81,497.60 : x
  2. Step 2: Convert to fraction form
    207,906.20/311,640.60 = 81,497.60/x
  3. Step 3: Cross multiply
    207,906.20x = 311,640.60 × 81,497.60
  4. Step 4: Simplify right side
    207,906.20x = 25,397,960,962.56
  5. Step 5: Solve for x
    x = 25,397,960,962.56/207,906.20
  6. Step 6: Final answer
    x = 122,160.67

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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.