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Finding the Fourth Proportional to 138,912.18, 191,694.84 and 81,550.56

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Solution

The fourth proportional to 138,912.18, 191,694.84 and 81,550.56 is: 112,537.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,912.18 : 191,694.84 = 81,550.56 : x
  2. Step 2: Convert to fraction form
    138,912.18/191,694.84 = 81,550.56/x
  3. Step 3: Cross multiply
    138,912.18x = 191,694.84 × 81,550.56
  4. Step 4: Simplify right side
    138,912.18x = 15,632,821,551.11
  5. Step 5: Solve for x
    x = 15,632,821,551.11/138,912.18
  6. Step 6: Final answer
    x = 112,537.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.