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Finding the Fourth Proportional to 331.20, 496.75 and 87.74

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Solution

The fourth proportional to 331.20, 496.75 and 87.74 is: 131.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 496.75 = 87.74 : x
  2. Step 2: Convert to fraction form
    331.20/496.75 = 87.74/x
  3. Step 3: Cross multiply
    331.20x = 496.75 × 87.74
  4. Step 4: Simplify right side
    331.20x = 43,584.85
  5. Step 5: Solve for x
    x = 43,584.85/331.20
  6. Step 6: Final answer
    x = 131.60

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