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Finding the Fourth Proportional to 1,261,789.89, 1,741,894.38 and 778,621.11

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Solution

The fourth proportional to 1,261,789.89, 1,741,894.38 and 778,621.11 is: 1,074,882.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261,789.89 : 1,741,894.38 = 778,621.11 : x
  2. Step 2: Convert to fraction form
    1,261,789.89/1,741,894.38 = 778,621.11/x
  3. Step 3: Cross multiply
    1,261,789.89x = 1,741,894.38 × 778,621.11
  4. Step 4: Simplify right side
    1,261,789.89x = 1,356,275,735,658.36
  5. Step 5: Solve for x
    x = 1,356,275,735,658.36/1,261,789.89
  6. Step 6: Final answer
    x = 1,074,882.39

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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.