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Finding the Fourth Proportional to 138.86, 208.07 and 98.09

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Solution

The fourth proportional to 138.86, 208.07 and 98.09 is: 146.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.86 : 208.07 = 98.09 : x
  2. Step 2: Convert to fraction form
    138.86/208.07 = 98.09/x
  3. Step 3: Cross multiply
    138.86x = 208.07 × 98.09
  4. Step 4: Simplify right side
    138.86x = 20,408.62
  5. Step 5: Solve for x
    x = 20,408.62/138.86
  6. Step 6: Final answer
    x = 146.97

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