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Finding the Fourth Proportional to 327.78, 491.87 and 239.77

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Solution

The fourth proportional to 327.78, 491.87 and 239.77 is: 359.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.78 : 491.87 = 239.77 : x
  2. Step 2: Convert to fraction form
    327.78/491.87 = 239.77/x
  3. Step 3: Cross multiply
    327.78x = 491.87 × 239.77
  4. Step 4: Simplify right side
    327.78x = 117,935.67
  5. Step 5: Solve for x
    x = 117,935.67/327.78
  6. Step 6: Final answer
    x = 359.80

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