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Finding the Fourth Proportional to 443.12, 611.68 and 399.36

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Solution

The fourth proportional to 443.12, 611.68 and 399.36 is: 551.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.12 : 611.68 = 399.36 : x
  2. Step 2: Convert to fraction form
    443.12/611.68 = 399.36/x
  3. Step 3: Cross multiply
    443.12x = 611.68 × 399.36
  4. Step 4: Simplify right side
    443.12x = 244,280.52
  5. Step 5: Solve for x
    x = 244,280.52/443.12
  6. Step 6: Final answer
    x = 551.27

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