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Finding the Fourth Proportional to 578.85, 868.39 and 331.80

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Solution

The fourth proportional to 578.85, 868.39 and 331.80 is: 497.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.85 : 868.39 = 331.80 : x
  2. Step 2: Convert to fraction form
    578.85/868.39 = 331.80/x
  3. Step 3: Cross multiply
    578.85x = 868.39 × 331.80
  4. Step 4: Simplify right side
    578.85x = 288,127.72
  5. Step 5: Solve for x
    x = 288,127.72/578.85
  6. Step 6: Final answer
    x = 497.76

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