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Finding the Fourth Proportional to 640.56, 960.84 and 229.62

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Solution

The fourth proportional to 640.56, 960.84 and 229.62 is: 344.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.56 : 960.84 = 229.62 : x
  2. Step 2: Convert to fraction form
    640.56/960.84 = 229.62/x
  3. Step 3: Cross multiply
    640.56x = 960.84 × 229.62
  4. Step 4: Simplify right side
    640.56x = 220,628.08
  5. Step 5: Solve for x
    x = 220,628.08/640.56
  6. Step 6: Final answer
    x = 344.43

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