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Finding the Fourth Proportional to 78.78, 118.27 and 66.83

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Solution

The fourth proportional to 78.78, 118.27 and 66.83 is: 100.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.78 : 118.27 = 66.83 : x
  2. Step 2: Convert to fraction form
    78.78/118.27 = 66.83/x
  3. Step 3: Cross multiply
    78.78x = 118.27 × 66.83
  4. Step 4: Simplify right side
    78.78x = 7,903.98
  5. Step 5: Solve for x
    x = 7,903.98/78.78
  6. Step 6: Final answer
    x = 100.33

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