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Finding the Fourth Proportional to 628.72, 942.86 and 217.75

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Solution

The fourth proportional to 628.72, 942.86 and 217.75 is: 326.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.72 : 942.86 = 217.75 : x
  2. Step 2: Convert to fraction form
    628.72/942.86 = 217.75/x
  3. Step 3: Cross multiply
    628.72x = 942.86 × 217.75
  4. Step 4: Simplify right side
    628.72x = 205,304.32
  5. Step 5: Solve for x
    x = 205,304.32/628.72
  6. Step 6: Final answer
    x = 326.54

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