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Finding the Fourth Proportional to 118, 163.16 and 99.80

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Solution

The fourth proportional to 118, 163.16 and 99.80 is: 137.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    118 : 163.16 = 99.80 : x
  2. Step 2: Convert to fraction form
    118/163.16 = 99.80/x
  3. Step 3: Cross multiply
    118x = 163.16 × 99.80
  4. Step 4: Simplify right side
    118x = 16,283.37
  5. Step 5: Solve for x
    x = 16,283.37/118
  6. Step 6: Final answer
    x = 137.99

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