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Finding the Fourth Proportional to 13.95, 21 and 12.69

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Solution

The fourth proportional to 13.95, 21 and 12.69 is: 19.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.95 : 21 = 12.69 : x
  2. Step 2: Convert to fraction form
    13.95/21 = 12.69/x
  3. Step 3: Cross multiply
    13.95x = 21 × 12.69
  4. Step 4: Simplify right side
    13.95x = 266.49
  5. Step 5: Solve for x
    x = 266.49/13.95
  6. Step 6: Final answer
    x = 19.10

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