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Finding the Fourth Proportional to 131.11, 196.36 and 76.90

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Solution

The fourth proportional to 131.11, 196.36 and 76.90 is: 115.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.11 : 196.36 = 76.90 : x
  2. Step 2: Convert to fraction form
    131.11/196.36 = 76.90/x
  3. Step 3: Cross multiply
    131.11x = 196.36 × 76.90
  4. Step 4: Simplify right side
    131.11x = 15,100.08
  5. Step 5: Solve for x
    x = 15,100.08/131.11
  6. Step 6: Final answer
    x = 115.17

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