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Finding the Fourth Proportional to 386.71, 533.91 and 239.50

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Solution

The fourth proportional to 386.71, 533.91 and 239.50 is: 330.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.71 : 533.91 = 239.50 : x
  2. Step 2: Convert to fraction form
    386.71/533.91 = 239.50/x
  3. Step 3: Cross multiply
    386.71x = 533.91 × 239.50
  4. Step 4: Simplify right side
    386.71x = 127,871.45
  5. Step 5: Solve for x
    x = 127,871.45/386.71
  6. Step 6: Final answer
    x = 330.66

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