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Finding the Fourth Proportional to 426.43, 638.32 and 328.68

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Solution

The fourth proportional to 426.43, 638.32 and 328.68 is: 491.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.43 : 638.32 = 328.68 : x
  2. Step 2: Convert to fraction form
    426.43/638.32 = 328.68/x
  3. Step 3: Cross multiply
    426.43x = 638.32 × 328.68
  4. Step 4: Simplify right side
    426.43x = 209,798.18
  5. Step 5: Solve for x
    x = 209,798.18/426.43
  6. Step 6: Final answer
    x = 491.99

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