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Finding the Fourth Proportional to 664.92, 997.68 and 408.60

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Solution

The fourth proportional to 664.92, 997.68 and 408.60 is: 613.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.92 : 997.68 = 408.60 : x
  2. Step 2: Convert to fraction form
    664.92/997.68 = 408.60/x
  3. Step 3: Cross multiply
    664.92x = 997.68 × 408.60
  4. Step 4: Simplify right side
    664.92x = 407,652.05
  5. Step 5: Solve for x
    x = 407,652.05/664.92
  6. Step 6: Final answer
    x = 613.08

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