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Finding the Fourth Proportional to 207,388.45, 311,131.88 and 67,147.07

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Solution

The fourth proportional to 207,388.45, 311,131.88 and 67,147.07 is: 100,736.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,388.45 : 311,131.88 = 67,147.07 : x
  2. Step 2: Convert to fraction form
    207,388.45/311,131.88 = 67,147.07/x
  3. Step 3: Cross multiply
    207,388.45x = 311,131.88 × 67,147.07
  4. Step 4: Simplify right side
    207,388.45x = 20,891,593,789.86
  5. Step 5: Solve for x
    x = 20,891,593,789.86/207,388.45
  6. Step 6: Final answer
    x = 100,736.54

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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.