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Finding the Fourth Proportional to 1,223,956, 1,689,217.68 and 687,412

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Solution

The fourth proportional to 1,223,956, 1,689,217.68 and 687,412 is: 948,717.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223,956 : 1,689,217.68 = 687,412 : x
  2. Step 2: Convert to fraction form
    1,223,956/1,689,217.68 = 687,412/x
  3. Step 3: Cross multiply
    1,223,956x = 1,689,217.68 × 687,412
  4. Step 4: Simplify right side
    1,223,956x = 1,161,188,503,844.16
  5. Step 5: Solve for x
    x = 1,161,188,503,844.16/1,223,956
  6. Step 6: Final answer
    x = 948,717.52

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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.