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Finding the Fourth Proportional to 136.78, 205.01 and 82.71

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Solution

The fourth proportional to 136.78, 205.01 and 82.71 is: 123.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.78 : 205.01 = 82.71 : x
  2. Step 2: Convert to fraction form
    136.78/205.01 = 82.71/x
  3. Step 3: Cross multiply
    136.78x = 205.01 × 82.71
  4. Step 4: Simplify right side
    136.78x = 16,956.38
  5. Step 5: Solve for x
    x = 16,956.38/136.78
  6. Step 6: Final answer
    x = 123.97

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