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Finding the Fourth Proportional to 667,608, 921,299.04 and 399,336

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Solution

The fourth proportional to 667,608, 921,299.04 and 399,336 is: 551,083.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,608 : 921,299.04 = 399,336 : x
  2. Step 2: Convert to fraction form
    667,608/921,299.04 = 399,336/x
  3. Step 3: Cross multiply
    667,608x = 921,299.04 × 399,336
  4. Step 4: Simplify right side
    667,608x = 367,907,873,437.44
  5. Step 5: Solve for x
    x = 367,907,873,437.44/667,608
  6. Step 6: Final answer
    x = 551,083.68

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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.