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Finding the Fourth Proportional to 667,926, 921,741.12 and 399,654

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Solution

The fourth proportional to 667,926, 921,741.12 and 399,654 is: 551,524.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,926 : 921,741.12 = 399,654 : x
  2. Step 2: Convert to fraction form
    667,926/921,741.12 = 399,654/x
  3. Step 3: Cross multiply
    667,926x = 921,741.12 × 399,654
  4. Step 4: Simplify right side
    667,926x = 368,377,525,572.48
  5. Step 5: Solve for x
    x = 368,377,525,572.48/667,926
  6. Step 6: Final answer
    x = 551,524.46

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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.