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Finding the Fourth Proportional to 394.56, 591.72 and 138

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Solution

The fourth proportional to 394.56, 591.72 and 138 is: 206.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.56 : 591.72 = 138 : x
  2. Step 2: Convert to fraction form
    394.56/591.72 = 138/x
  3. Step 3: Cross multiply
    394.56x = 591.72 × 138
  4. Step 4: Simplify right side
    394.56x = 81,657.36
  5. Step 5: Solve for x
    x = 81,657.36/394.56
  6. Step 6: Final answer
    x = 206.96

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