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Finding the Fourth Proportional to 680.94, 939.77 and 386.31

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Solution

The fourth proportional to 680.94, 939.77 and 386.31 is: 533.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.94 : 939.77 = 386.31 : x
  2. Step 2: Convert to fraction form
    680.94/939.77 = 386.31/x
  3. Step 3: Cross multiply
    680.94x = 939.77 × 386.31
  4. Step 4: Simplify right side
    680.94x = 363,042.55
  5. Step 5: Solve for x
    x = 363,042.55/680.94
  6. Step 6: Final answer
    x = 533.15

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