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Finding the Fourth Proportional to 121, 166.92 and 91.88

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Solution

The fourth proportional to 121, 166.92 and 91.88 is: 126.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    121 : 166.92 = 91.88 : x
  2. Step 2: Convert to fraction form
    121/166.92 = 91.88/x
  3. Step 3: Cross multiply
    121x = 166.92 × 91.88
  4. Step 4: Simplify right side
    121x = 15,336.61
  5. Step 5: Solve for x
    x = 15,336.61/121
  6. Step 6: Final answer
    x = 126.75

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