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Finding the Fourth Proportional to 399,353.09, 551,129.67 and 218,081.87

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Solution

The fourth proportional to 399,353.09, 551,129.67 and 218,081.87 is: 300,965.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,353.09 : 551,129.67 = 218,081.87 : x
  2. Step 2: Convert to fraction form
    399,353.09/551,129.67 = 218,081.87/x
  3. Step 3: Cross multiply
    399,353.09x = 551,129.67 × 218,081.87
  4. Step 4: Simplify right side
    399,353.09x = 120,191,388,357.17
  5. Step 5: Solve for x
    x = 120,191,388,357.17/399,353.09
  6. Step 6: Final answer
    x = 300,965.22

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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.