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Finding the Fourth Proportional to 309.25, 425.92 and 287.73

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Solution

The fourth proportional to 309.25, 425.92 and 287.73 is: 396.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.25 : 425.92 = 287.73 : x
  2. Step 2: Convert to fraction form
    309.25/425.92 = 287.73/x
  3. Step 3: Cross multiply
    309.25x = 425.92 × 287.73
  4. Step 4: Simplify right side
    309.25x = 122,549.96
  5. Step 5: Solve for x
    x = 122,549.96/309.25
  6. Step 6: Final answer
    x = 396.28

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