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Finding the Fourth Proportional to 20.96, 31.36 and 12.92

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Solution

The fourth proportional to 20.96, 31.36 and 12.92 is: 19.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.96 : 31.36 = 12.92 : x
  2. Step 2: Convert to fraction form
    20.96/31.36 = 12.92/x
  3. Step 3: Cross multiply
    20.96x = 31.36 × 12.92
  4. Step 4: Simplify right side
    20.96x = 405.17
  5. Step 5: Solve for x
    x = 405.17/20.96
  6. Step 6: Final answer
    x = 19.33

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