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Finding the Fourth Proportional to 667,938, 921,757.68 and 399,666

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Solution

The fourth proportional to 667,938, 921,757.68 and 399,666 is: 551,541.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,938 : 921,757.68 = 399,666 : x
  2. Step 2: Convert to fraction form
    667,938/921,757.68 = 399,666/x
  3. Step 3: Cross multiply
    667,938x = 921,757.68 × 399,666
  4. Step 4: Simplify right side
    667,938x = 368,395,204,934.88
  5. Step 5: Solve for x
    x = 368,395,204,934.88/667,938
  6. Step 6: Final answer
    x = 551,541.02

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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.