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Finding the Fourth Proportional to 331.72, 497.81 and 139.34

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Solution

The fourth proportional to 331.72, 497.81 and 139.34 is: 209.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.72 : 497.81 = 139.34 : x
  2. Step 2: Convert to fraction form
    331.72/497.81 = 139.34/x
  3. Step 3: Cross multiply
    331.72x = 497.81 × 139.34
  4. Step 4: Simplify right side
    331.72x = 69,366.44
  5. Step 5: Solve for x
    x = 69,366.44/331.72
  6. Step 6: Final answer
    x = 209.11

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