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Finding the Fourth Proportional to 287.56, 396.81 and 163.22

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Solution

The fourth proportional to 287.56, 396.81 and 163.22 is: 225.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.56 : 396.81 = 163.22 : x
  2. Step 2: Convert to fraction form
    287.56/396.81 = 163.22/x
  3. Step 3: Cross multiply
    287.56x = 396.81 × 163.22
  4. Step 4: Simplify right side
    287.56x = 64,764.89
  5. Step 5: Solve for x
    x = 64,764.89/287.56
  6. Step 6: Final answer
    x = 225.22

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