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Finding the Fourth Proportional to 12.55, 18.82 and 3.99

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Solution

The fourth proportional to 12.55, 18.82 and 3.99 is: 5.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.55 : 18.82 = 3.99 : x
  2. Step 2: Convert to fraction form
    12.55/18.82 = 3.99/x
  3. Step 3: Cross multiply
    12.55x = 18.82 × 3.99
  4. Step 4: Simplify right side
    12.55x = 75.08
  5. Step 5: Solve for x
    x = 75.08/12.55
  6. Step 6: Final answer
    x = 5.98

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