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Finding the Fourth Proportional to 399.87, 551.43 and 301.86

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Solution

The fourth proportional to 399.87, 551.43 and 301.86 is: 416.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.87 : 551.43 = 301.86 : x
  2. Step 2: Convert to fraction form
    399.87/551.43 = 301.86/x
  3. Step 3: Cross multiply
    399.87x = 551.43 × 301.86
  4. Step 4: Simplify right side
    399.87x = 166,454.66
  5. Step 5: Solve for x
    x = 166,454.66/399.87
  6. Step 6: Final answer
    x = 416.27

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