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Finding the Fourth Proportional to 216.81, 325.18 and 79.82

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Solution

The fourth proportional to 216.81, 325.18 and 79.82 is: 119.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.81 : 325.18 = 79.82 : x
  2. Step 2: Convert to fraction form
    216.81/325.18 = 79.82/x
  3. Step 3: Cross multiply
    216.81x = 325.18 × 79.82
  4. Step 4: Simplify right side
    216.81x = 25,955.56
  5. Step 5: Solve for x
    x = 25,955.56/216.81
  6. Step 6: Final answer
    x = 119.72

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