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Finding the Fourth Proportional to 81.82, 122.64 and 41.18

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Solution

The fourth proportional to 81.82, 122.64 and 41.18 is: 61.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.82 : 122.64 = 41.18 : x
  2. Step 2: Convert to fraction form
    81.82/122.64 = 41.18/x
  3. Step 3: Cross multiply
    81.82x = 122.64 × 41.18
  4. Step 4: Simplify right side
    81.82x = 5,050.32
  5. Step 5: Solve for x
    x = 5,050.32/81.82
  6. Step 6: Final answer
    x = 61.72

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