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Finding the Fourth Proportional to 12.88, 19.31 and 12.55

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Solution

The fourth proportional to 12.88, 19.31 and 12.55 is: 18.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.88 : 19.31 = 12.55 : x
  2. Step 2: Convert to fraction form
    12.88/19.31 = 12.55/x
  3. Step 3: Cross multiply
    12.88x = 19.31 × 12.55
  4. Step 4: Simplify right side
    12.88x = 242.36
  5. Step 5: Solve for x
    x = 242.36/12.88
  6. Step 6: Final answer
    x = 18.82

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