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Finding the Fourth Proportional to 643.04, 964.08 and 318.24

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Solution

The fourth proportional to 643.04, 964.08 and 318.24 is: 477.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.04 : 964.08 = 318.24 : x
  2. Step 2: Convert to fraction form
    643.04/964.08 = 318.24/x
  3. Step 3: Cross multiply
    643.04x = 964.08 × 318.24
  4. Step 4: Simplify right side
    643.04x = 306,808.82
  5. Step 5: Solve for x
    x = 306,808.82/643.04
  6. Step 6: Final answer
    x = 477.12

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