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Finding the Fourth Proportional to 658.56, 987.89 and 219.80

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Solution

The fourth proportional to 658.56, 987.89 and 219.80 is: 329.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.56 : 987.89 = 219.80 : x
  2. Step 2: Convert to fraction form
    658.56/987.89 = 219.80/x
  3. Step 3: Cross multiply
    658.56x = 987.89 × 219.80
  4. Step 4: Simplify right side
    658.56x = 217,133.83
  5. Step 5: Solve for x
    x = 217,133.83/658.56
  6. Step 6: Final answer
    x = 329.71

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