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Finding the Fourth Proportional to 255.22, 382.81 and 81.91

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Solution

The fourth proportional to 255.22, 382.81 and 81.91 is: 122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.22 : 382.81 = 81.91 : x
  2. Step 2: Convert to fraction form
    255.22/382.81 = 81.91/x
  3. Step 3: Cross multiply
    255.22x = 382.81 × 81.91
  4. Step 4: Simplify right side
    255.22x = 31,355.01
  5. Step 5: Solve for x
    x = 31,355.01/255.22
  6. Step 6: Final answer
    x = 122.85

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