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Finding the Fourth Proportional to 399,858.83, 551,805.16 and 218,571.51

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Solution

The fourth proportional to 399,858.83, 551,805.16 and 218,571.51 is: 301,628.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,858.83 : 551,805.16 = 218,571.51 : x
  2. Step 2: Convert to fraction form
    399,858.83/551,805.16 = 218,571.51/x
  3. Step 3: Cross multiply
    399,858.83x = 551,805.16 × 218,571.51
  4. Step 4: Simplify right side
    399,858.83x = 120,608,888,979.65
  5. Step 5: Solve for x
    x = 120,608,888,979.65/399,858.83
  6. Step 6: Final answer
    x = 301,628.68

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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.