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Finding the Fourth Proportional to 439.97, 659.72 and 257.42

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Solution

The fourth proportional to 439.97, 659.72 and 257.42 is: 385.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.97 : 659.72 = 257.42 : x
  2. Step 2: Convert to fraction form
    439.97/659.72 = 257.42/x
  3. Step 3: Cross multiply
    439.97x = 659.72 × 257.42
  4. Step 4: Simplify right side
    439.97x = 169,820.54
  5. Step 5: Solve for x
    x = 169,820.54/439.97
  6. Step 6: Final answer
    x = 385.99

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