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Finding the Fourth Proportional to 399, 551.34 and 312.33

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Solution

The fourth proportional to 399, 551.34 and 312.33 is: 431.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    399 : 551.34 = 312.33 : x
  2. Step 2: Convert to fraction form
    399/551.34 = 312.33/x
  3. Step 3: Cross multiply
    399x = 551.34 × 312.33
  4. Step 4: Simplify right side
    399x = 172,200.02
  5. Step 5: Solve for x
    x = 172,200.02/399
  6. Step 6: Final answer
    x = 431.58

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