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Finding the Fourth Proportional to 57, 85.36 and 38.88

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Solution

The fourth proportional to 57, 85.36 and 38.88 is: 58.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    57 : 85.36 = 38.88 : x
  2. Step 2: Convert to fraction form
    57/85.36 = 38.88/x
  3. Step 3: Cross multiply
    57x = 85.36 × 38.88
  4. Step 4: Simplify right side
    57x = 3,318.80
  5. Step 5: Solve for x
    x = 3,318.80/57
  6. Step 6: Final answer
    x = 58.22

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