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Finding the Fourth Proportional to 86.05, 129.05 and 31.96

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Solution

The fourth proportional to 86.05, 129.05 and 31.96 is: 47.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.05 : 129.05 = 31.96 : x
  2. Step 2: Convert to fraction form
    86.05/129.05 = 31.96/x
  3. Step 3: Cross multiply
    86.05x = 129.05 × 31.96
  4. Step 4: Simplify right side
    86.05x = 4,123.63
  5. Step 5: Solve for x
    x = 4,123.63/86.05
  6. Step 6: Final answer
    x = 47.92

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