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Finding the Fourth Proportional to 81.06, 121.64 and 35.43

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Solution

The fourth proportional to 81.06, 121.64 and 35.43 is: 53.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.06 : 121.64 = 35.43 : x
  2. Step 2: Convert to fraction form
    81.06/121.64 = 35.43/x
  3. Step 3: Cross multiply
    81.06x = 121.64 × 35.43
  4. Step 4: Simplify right side
    81.06x = 4,309.71
  5. Step 5: Solve for x
    x = 4,309.71/81.06
  6. Step 6: Final answer
    x = 53.17

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