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Finding the Fourth Proportional to 80.00, 120 and 31.92

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Solution

The fourth proportional to 80.00, 120 and 31.92 is: 47.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.00 : 120 = 31.92 : x
  2. Step 2: Convert to fraction form
    80.00/120 = 31.92/x
  3. Step 3: Cross multiply
    80.00x = 120 × 31.92
  4. Step 4: Simplify right side
    80.00x = 3,830.40
  5. Step 5: Solve for x
    x = 3,830.40/80.00
  6. Step 6: Final answer
    x = 47.88

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