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Finding the Fourth Proportional to 799.97, 1,198.91 and 312.75

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Solution

The fourth proportional to 799.97, 1,198.91 and 312.75 is: 468.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.97 : 1,198.91 = 312.75 : x
  2. Step 2: Convert to fraction form
    799.97/1,198.91 = 312.75/x
  3. Step 3: Cross multiply
    799.97x = 1,198.91 × 312.75
  4. Step 4: Simplify right side
    799.97x = 374,959.88
  5. Step 5: Solve for x
    x = 374,959.88/799.97
  6. Step 6: Final answer
    x = 468.72

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