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Finding the Fourth Proportional to 118.12, 176.91 and 90.85

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Solution

The fourth proportional to 118.12, 176.91 and 90.85 is: 136.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.12 : 176.91 = 90.85 : x
  2. Step 2: Convert to fraction form
    118.12/176.91 = 90.85/x
  3. Step 3: Cross multiply
    118.12x = 176.91 × 90.85
  4. Step 4: Simplify right side
    118.12x = 16,072.27
  5. Step 5: Solve for x
    x = 16,072.27/118.12
  6. Step 6: Final answer
    x = 136.07

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