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Finding the Fourth Proportional to 91.36, 136.91 and 84.61

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Solution

The fourth proportional to 91.36, 136.91 and 84.61 is: 126.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 136.91 = 84.61 : x
  2. Step 2: Convert to fraction form
    91.36/136.91 = 84.61/x
  3. Step 3: Cross multiply
    91.36x = 136.91 × 84.61
  4. Step 4: Simplify right side
    91.36x = 11,583.53
  5. Step 5: Solve for x
    x = 11,583.53/91.36
  6. Step 6: Final answer
    x = 126.79

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