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Finding the Fourth Proportional to 81, 121.32 and 52.08

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Solution

The fourth proportional to 81, 121.32 and 52.08 is: 78.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 121.32 = 52.08 : x
  2. Step 2: Convert to fraction form
    81/121.32 = 52.08/x
  3. Step 3: Cross multiply
    81x = 121.32 × 52.08
  4. Step 4: Simplify right side
    81x = 6,318.35
  5. Step 5: Solve for x
    x = 6,318.35/81
  6. Step 6: Final answer
    x = 78.00

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