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Finding the Fourth Proportional to 112.22, 168.42 and 81.84

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Solution

The fourth proportional to 112.22, 168.42 and 81.84 is: 122.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.22 : 168.42 = 81.84 : x
  2. Step 2: Convert to fraction form
    112.22/168.42 = 81.84/x
  3. Step 3: Cross multiply
    112.22x = 168.42 × 81.84
  4. Step 4: Simplify right side
    112.22x = 13,783.49
  5. Step 5: Solve for x
    x = 13,783.49/112.22
  6. Step 6: Final answer
    x = 122.83

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