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Finding the Fourth Proportional to 815,757.93, 1,223,661 and 389,338.62

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Solution

The fourth proportional to 815,757.93, 1,223,661 and 389,338.62 is: 584,019.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,757.93 : 1,223,661 = 389,338.62 : x
  2. Step 2: Convert to fraction form
    815,757.93/1,223,661 = 389,338.62/x
  3. Step 3: Cross multiply
    815,757.93x = 1,223,661 × 389,338.62
  4. Step 4: Simplify right side
    815,757.93x = 476,418,485,087.82
  5. Step 5: Solve for x
    x = 476,418,485,087.82/815,757.93
  6. Step 6: Final answer
    x = 584,019.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.