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Finding the Fourth Proportional to 139.08, 208.44 and 102.84

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Solution

The fourth proportional to 139.08, 208.44 and 102.84 is: 154.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.08 : 208.44 = 102.84 : x
  2. Step 2: Convert to fraction form
    139.08/208.44 = 102.84/x
  3. Step 3: Cross multiply
    139.08x = 208.44 × 102.84
  4. Step 4: Simplify right side
    139.08x = 21,435.97
  5. Step 5: Solve for x
    x = 21,435.97/139.08
  6. Step 6: Final answer
    x = 154.13

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