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Finding the Fourth Proportional to 138.06, 207.12 and 76.37

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Solution

The fourth proportional to 138.06, 207.12 and 76.37 is: 114.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.06 : 207.12 = 76.37 : x
  2. Step 2: Convert to fraction form
    138.06/207.12 = 76.37/x
  3. Step 3: Cross multiply
    138.06x = 207.12 × 76.37
  4. Step 4: Simplify right side
    138.06x = 15,816.72
  5. Step 5: Solve for x
    x = 15,816.72/138.06
  6. Step 6: Final answer
    x = 114.56

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