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Finding the Fourth Proportional to 664.62, 996.32 and 390.95

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Solution

The fourth proportional to 664.62, 996.32 and 390.95 is: 586.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.62 : 996.32 = 390.95 : x
  2. Step 2: Convert to fraction form
    664.62/996.32 = 390.95/x
  3. Step 3: Cross multiply
    664.62x = 996.32 × 390.95
  4. Step 4: Simplify right side
    664.62x = 389,504.37
  5. Step 5: Solve for x
    x = 389,504.37/664.62
  6. Step 6: Final answer
    x = 586.06

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