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Finding the Fourth Proportional to 391.22, 539.84 and 216.57

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Solution

The fourth proportional to 391.22, 539.84 and 216.57 is: 298.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.22 : 539.84 = 216.57 : x
  2. Step 2: Convert to fraction form
    391.22/539.84 = 216.57/x
  3. Step 3: Cross multiply
    391.22x = 539.84 × 216.57
  4. Step 4: Simplify right side
    391.22x = 116,909.37
  5. Step 5: Solve for x
    x = 116,909.37/391.22
  6. Step 6: Final answer
    x = 298.83

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