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Finding the Fourth Proportional to 139.87, 209.93 and 71.44

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Solution

The fourth proportional to 139.87, 209.93 and 71.44 is: 107.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.87 : 209.93 = 71.44 : x
  2. Step 2: Convert to fraction form
    139.87/209.93 = 71.44/x
  3. Step 3: Cross multiply
    139.87x = 209.93 × 71.44
  4. Step 4: Simplify right side
    139.87x = 14,996.70
  5. Step 5: Solve for x
    x = 14,996.70/139.87
  6. Step 6: Final answer
    x = 107.22

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