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Finding the Fourth Proportional to 86.00, 128.99 and 73.17

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Solution

The fourth proportional to 86.00, 128.99 and 73.17 is: 109.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.00 : 128.99 = 73.17 : x
  2. Step 2: Convert to fraction form
    86.00/128.99 = 73.17/x
  3. Step 3: Cross multiply
    86.00x = 128.99 × 73.17
  4. Step 4: Simplify right side
    86.00x = 9,438.38
  5. Step 5: Solve for x
    x = 9,438.38/86.00
  6. Step 6: Final answer
    x = 109.76

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