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Finding the Fourth Proportional to 203.31, 304.83 and 81.43

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Solution

The fourth proportional to 203.31, 304.83 and 81.43 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.31 : 304.83 = 81.43 : x
  2. Step 2: Convert to fraction form
    203.31/304.83 = 81.43/x
  3. Step 3: Cross multiply
    203.31x = 304.83 × 81.43
  4. Step 4: Simplify right side
    203.31x = 24,821.54
  5. Step 5: Solve for x
    x = 24,821.54/203.31
  6. Step 6: Final answer
    x = 122.09

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