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Finding the Fourth Proportional to 399,471.80, 551,268.28 and 218,183.78

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Solution

The fourth proportional to 399,471.80, 551,268.28 and 218,183.78 is: 301,092.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,471.80 : 551,268.28 = 218,183.78 : x
  2. Step 2: Convert to fraction form
    399,471.80/551,268.28 = 218,183.78/x
  3. Step 3: Cross multiply
    399,471.80x = 551,268.28 × 218,183.78
  4. Step 4: Simplify right side
    399,471.80x = 120,277,795,674.52
  5. Step 5: Solve for x
    x = 120,277,795,674.52/399,471.80
  6. Step 6: Final answer
    x = 301,092.08

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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.