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Finding the Fourth Proportional to 86.16, 129.28 and 38.08

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Solution

The fourth proportional to 86.16, 129.28 and 38.08 is: 57.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.16 : 129.28 = 38.08 : x
  2. Step 2: Convert to fraction form
    86.16/129.28 = 38.08/x
  3. Step 3: Cross multiply
    86.16x = 129.28 × 38.08
  4. Step 4: Simplify right side
    86.16x = 4,922.98
  5. Step 5: Solve for x
    x = 4,922.98/86.16
  6. Step 6: Final answer
    x = 57.14

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