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Finding the Fourth Proportional to 86.00, 128.72 and 75.13

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Solution

The fourth proportional to 86.00, 128.72 and 75.13 is: 112.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.00 : 128.72 = 75.13 : x
  2. Step 2: Convert to fraction form
    86.00/128.72 = 75.13/x
  3. Step 3: Cross multiply
    86.00x = 128.72 × 75.13
  4. Step 4: Simplify right side
    86.00x = 9,670.60
  5. Step 5: Solve for x
    x = 9,670.60/86.00
  6. Step 6: Final answer
    x = 112.46

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