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Finding the Fourth Proportional to 69,375.92, 104,066.78 and 21,989.97

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Solution

The fourth proportional to 69,375.92, 104,066.78 and 21,989.97 is: 32,985.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,375.92 : 104,066.78 = 21,989.97 : x
  2. Step 2: Convert to fraction form
    69,375.92/104,066.78 = 21,989.97/x
  3. Step 3: Cross multiply
    69,375.92x = 104,066.78 × 21,989.97
  4. Step 4: Simplify right side
    69,375.92x = 2,288,425,260.25
  5. Step 5: Solve for x
    x = 2,288,425,260.25/69,375.92
  6. Step 6: Final answer
    x = 32,985.88

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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.