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Finding the Fourth Proportional to 81, 111.73 and 57.67

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Solution

The fourth proportional to 81, 111.73 and 57.67 is: 79.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 111.73 = 57.67 : x
  2. Step 2: Convert to fraction form
    81/111.73 = 57.67/x
  3. Step 3: Cross multiply
    81x = 111.73 × 57.67
  4. Step 4: Simplify right side
    81x = 6,443.47
  5. Step 5: Solve for x
    x = 6,443.47/81
  6. Step 6: Final answer
    x = 79.55

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