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Finding the Fourth Proportional to 1,296,965.88, 1,789,843.10 and 813,551.40

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Solution

The fourth proportional to 1,296,965.88, 1,789,843.10 and 813,551.40 is: 1,122,719.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296,965.88 : 1,789,843.10 = 813,551.40 : x
  2. Step 2: Convert to fraction form
    1,296,965.88/1,789,843.10 = 813,551.40/x
  3. Step 3: Cross multiply
    1,296,965.88x = 1,789,843.10 × 813,551.40
  4. Step 4: Simplify right side
    1,296,965.88x = 1,456,129,355,717.58
  5. Step 5: Solve for x
    x = 1,456,129,355,717.58/1,296,965.88
  6. Step 6: Final answer
    x = 1,122,719.86

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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.