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Finding the Fourth Proportional to 721,891.44, 996,198.10 and 399,594.60

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Solution

The fourth proportional to 721,891.44, 996,198.10 and 399,594.60 is: 551,433.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,891.44 : 996,198.10 = 399,594.60 : x
  2. Step 2: Convert to fraction form
    721,891.44/996,198.10 = 399,594.60/x
  3. Step 3: Cross multiply
    721,891.44x = 996,198.10 × 399,594.60
  4. Step 4: Simplify right side
    721,891.44x = 398,075,380,291.27
  5. Step 5: Solve for x
    x = 398,075,380,291.27/721,891.44
  6. Step 6: Final answer
    x = 551,433.86

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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.