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Finding the Fourth Proportional to 648.08, 971.61 and 318.88

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Solution

The fourth proportional to 648.08, 971.61 and 318.88 is: 478.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.08 : 971.61 = 318.88 : x
  2. Step 2: Convert to fraction form
    648.08/971.61 = 318.88/x
  3. Step 3: Cross multiply
    648.08x = 971.61 × 318.88
  4. Step 4: Simplify right side
    648.08x = 309,827.00
  5. Step 5: Solve for x
    x = 309,827.00/648.08
  6. Step 6: Final answer
    x = 478.07

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