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Finding the Fourth Proportional to 608.72, 912.98 and 218.64

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Solution

The fourth proportional to 608.72, 912.98 and 218.64 is: 327.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.72 : 912.98 = 218.64 : x
  2. Step 2: Convert to fraction form
    608.72/912.98 = 218.64/x
  3. Step 3: Cross multiply
    608.72x = 912.98 × 218.64
  4. Step 4: Simplify right side
    608.72x = 199,612.85
  5. Step 5: Solve for x
    x = 199,612.85/608.72
  6. Step 6: Final answer
    x = 327.92

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