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Finding the Fourth Proportional to 399,326.29, 551,072.97 and 218,039.49

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Solution

The fourth proportional to 399,326.29, 551,072.97 and 218,039.49 is: 300,895.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,326.29 : 551,072.97 = 218,039.49 : x
  2. Step 2: Convert to fraction form
    399,326.29/551,072.97 = 218,039.49/x
  3. Step 3: Cross multiply
    399,326.29x = 551,072.97 × 218,039.49
  4. Step 4: Simplify right side
    399,326.29x = 120,155,669,331.59
  5. Step 5: Solve for x
    x = 120,155,669,331.59/399,326.29
  6. Step 6: Final answer
    x = 300,895.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.