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Finding the Fourth Proportional to 20.76, 31.08 and 11.72

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Solution

The fourth proportional to 20.76, 31.08 and 11.72 is: 17.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.76 : 31.08 = 11.72 : x
  2. Step 2: Convert to fraction form
    20.76/31.08 = 11.72/x
  3. Step 3: Cross multiply
    20.76x = 31.08 × 11.72
  4. Step 4: Simplify right side
    20.76x = 364.29
  5. Step 5: Solve for x
    x = 364.29/20.76
  6. Step 6: Final answer
    x = 17.55

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