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Finding the Fourth Proportional to 86.12, 129.20 and 25.25

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Solution

The fourth proportional to 86.12, 129.20 and 25.25 is: 37.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.12 : 129.20 = 25.25 : x
  2. Step 2: Convert to fraction form
    86.12/129.20 = 25.25/x
  3. Step 3: Cross multiply
    86.12x = 129.20 × 25.25
  4. Step 4: Simplify right side
    86.12x = 3,261.98
  5. Step 5: Solve for x
    x = 3,261.98/86.12
  6. Step 6: Final answer
    x = 37.88

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