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Finding the Fourth Proportional to 399,387.69, 551,144.43 and 218,090.25

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Solution

The fourth proportional to 399,387.69, 551,144.43 and 218,090.25 is: 300,958.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,387.69 : 551,144.43 = 218,090.25 : x
  2. Step 2: Convert to fraction form
    399,387.69/551,144.43 = 218,090.25/x
  3. Step 3: Cross multiply
    399,387.69x = 551,144.43 × 218,090.25
  4. Step 4: Simplify right side
    399,387.69x = 120,199,226,524.81
  5. Step 5: Solve for x
    x = 120,199,226,524.81/399,387.69
  6. Step 6: Final answer
    x = 300,958.77

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