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Finding the Fourth Proportional to 207,665.26, 311,523.70 and 81,289.06

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Solution

The fourth proportional to 207,665.26, 311,523.70 and 81,289.06 is: 121,943.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,665.26 : 311,523.70 = 81,289.06 : x
  2. Step 2: Convert to fraction form
    207,665.26/311,523.70 = 81,289.06/x
  3. Step 3: Cross multiply
    207,665.26x = 311,523.70 × 81,289.06
  4. Step 4: Simplify right side
    207,665.26x = 25,323,468,740.72
  5. Step 5: Solve for x
    x = 25,323,468,740.72/207,665.26
  6. Step 6: Final answer
    x = 121,943.69

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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.