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Finding the Fourth Proportional to 399,392.91, 551,163.56 and 218,106.81

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Solution

The fourth proportional to 399,392.91, 551,163.56 and 218,106.81 is: 300,988.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,392.91 : 551,163.56 = 218,106.81 : x
  2. Step 2: Convert to fraction form
    399,392.91/551,163.56 = 218,106.81/x
  3. Step 3: Cross multiply
    399,392.91x = 551,163.56 × 218,106.81
  4. Step 4: Simplify right side
    399,392.91x = 120,212,524,769.31
  5. Step 5: Solve for x
    x = 120,212,524,769.31/399,392.91
  6. Step 6: Final answer
    x = 300,988.13

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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.