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Finding the Fourth Proportional to 1,296,966.38, 1,789,843.79 and 813,551.90

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Solution

The fourth proportional to 1,296,966.38, 1,789,843.79 and 813,551.90 is: 1,122,720.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296,966.38 : 1,789,843.79 = 813,551.90 : x
  2. Step 2: Convert to fraction form
    1,296,966.38/1,789,843.79 = 813,551.90/x
  3. Step 3: Cross multiply
    1,296,966.38x = 1,789,843.79 × 813,551.90
  4. Step 4: Simplify right side
    1,296,966.38x = 1,456,130,811,989.94
  5. Step 5: Solve for x
    x = 1,456,130,811,989.94/1,296,966.38
  6. Step 6: Final answer
    x = 1,122,720.55

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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.