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Finding the Fourth Proportional to 439.47, 605.16 and 314.91

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Solution

The fourth proportional to 439.47, 605.16 and 314.91 is: 433.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.47 : 605.16 = 314.91 : x
  2. Step 2: Convert to fraction form
    439.47/605.16 = 314.91/x
  3. Step 3: Cross multiply
    439.47x = 605.16 × 314.91
  4. Step 4: Simplify right side
    439.47x = 190,570.94
  5. Step 5: Solve for x
    x = 190,570.94/439.47
  6. Step 6: Final answer
    x = 433.64

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