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Finding the Fourth Proportional to 131.03, 180.90 and 81.96

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Solution

The fourth proportional to 131.03, 180.90 and 81.96 is: 113.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.03 : 180.90 = 81.96 : x
  2. Step 2: Convert to fraction form
    131.03/180.90 = 81.96/x
  3. Step 3: Cross multiply
    131.03x = 180.90 × 81.96
  4. Step 4: Simplify right side
    131.03x = 14,826.56
  5. Step 5: Solve for x
    x = 14,826.56/131.03
  6. Step 6: Final answer
    x = 113.16

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