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Finding the Fourth Proportional to 111.13, 166.79 and 77.11

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Solution

The fourth proportional to 111.13, 166.79 and 77.11 is: 115.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.13 : 166.79 = 77.11 : x
  2. Step 2: Convert to fraction form
    111.13/166.79 = 77.11/x
  3. Step 3: Cross multiply
    111.13x = 166.79 × 77.11
  4. Step 4: Simplify right side
    111.13x = 12,860.95
  5. Step 5: Solve for x
    x = 12,860.95/111.13
  6. Step 6: Final answer
    x = 115.73

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