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Finding the Fourth Proportional to 644, 966.18 and 319.28

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Solution

The fourth proportional to 644, 966.18 and 319.28 is: 479.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    644 : 966.18 = 319.28 : x
  2. Step 2: Convert to fraction form
    644/966.18 = 319.28/x
  3. Step 3: Cross multiply
    644x = 966.18 × 319.28
  4. Step 4: Simplify right side
    644x = 308,481.95
  5. Step 5: Solve for x
    x = 308,481.95/644
  6. Step 6: Final answer
    x = 479.01

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