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Finding the Fourth Proportional to 1,331,781.78, 1,837,858.86 and 728,169.78

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Solution

The fourth proportional to 1,331,781.78, 1,837,858.86 and 728,169.78 is: 1,004,874.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331,781.78 : 1,837,858.86 = 728,169.78 : x
  2. Step 2: Convert to fraction form
    1,331,781.78/1,837,858.86 = 728,169.78/x
  3. Step 3: Cross multiply
    1,331,781.78x = 1,837,858.86 × 728,169.78
  4. Step 4: Simplify right side
    1,331,781.78x = 1,338,273,281,757.25
  5. Step 5: Solve for x
    x = 1,338,273,281,757.25/1,331,781.78
  6. Step 6: Final answer
    x = 1,004,874.30

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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.