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Finding the Fourth Proportional to 86.64, 129.93 and 25.75

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Solution

The fourth proportional to 86.64, 129.93 and 25.75 is: 38.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.64 : 129.93 = 25.75 : x
  2. Step 2: Convert to fraction form
    86.64/129.93 = 25.75/x
  3. Step 3: Cross multiply
    86.64x = 129.93 × 25.75
  4. Step 4: Simplify right side
    86.64x = 3,346.14
  5. Step 5: Solve for x
    x = 3,346.14/86.64
  6. Step 6: Final answer
    x = 38.62

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