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Finding the Fourth Proportional to 86.28, 119.12 and 78.08

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Solution

The fourth proportional to 86.28, 119.12 and 78.08 is: 107.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.28 : 119.12 = 78.08 : x
  2. Step 2: Convert to fraction form
    86.28/119.12 = 78.08/x
  3. Step 3: Cross multiply
    86.28x = 119.12 × 78.08
  4. Step 4: Simplify right side
    86.28x = 9,300.89
  5. Step 5: Solve for x
    x = 9,300.89/86.28
  6. Step 6: Final answer
    x = 107.80

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