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Finding the Fourth Proportional to 324.12, 486.16 and 80.64

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Solution

The fourth proportional to 324.12, 486.16 and 80.64 is: 120.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.12 : 486.16 = 80.64 : x
  2. Step 2: Convert to fraction form
    324.12/486.16 = 80.64/x
  3. Step 3: Cross multiply
    324.12x = 486.16 × 80.64
  4. Step 4: Simplify right side
    324.12x = 39,203.94
  5. Step 5: Solve for x
    x = 39,203.94/324.12
  6. Step 6: Final answer
    x = 120.96

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