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Finding the Fourth Proportional to 139, 208.44 and 66.84

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Solution

The fourth proportional to 139, 208.44 and 66.84 is: 100.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139 : 208.44 = 66.84 : x
  2. Step 2: Convert to fraction form
    139/208.44 = 66.84/x
  3. Step 3: Cross multiply
    139x = 208.44 × 66.84
  4. Step 4: Simplify right side
    139x = 13,932.13
  5. Step 5: Solve for x
    x = 13,932.13/139
  6. Step 6: Final answer
    x = 100.23

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