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Finding the Fourth Proportional to 386.07, 532.78 and 220.31

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Solution

The fourth proportional to 386.07, 532.78 and 220.31 is: 304.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.07 : 532.78 = 220.31 : x
  2. Step 2: Convert to fraction form
    386.07/532.78 = 220.31/x
  3. Step 3: Cross multiply
    386.07x = 532.78 × 220.31
  4. Step 4: Simplify right side
    386.07x = 117,375.55
  5. Step 5: Solve for x
    x = 117,375.55/386.07
  6. Step 6: Final answer
    x = 304.03

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