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Finding the Third Proportional to 638,882 and 990,615

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Solution

The third proportional to 638,882 and 990,615 is: 1,535,992.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,882 : 990,615 = 990,615 : x
  2. Step 2: Convert to fraction form
    638,882/990,615 = 990,615/x
  3. Step 3: Cross multiply
    638,882x = 990,615 × 990,615
  4. Step 4: Simplify right side
    638,882x = 981,318,078,225
  5. Step 5: Solve for x
    x = 981,318,078,225/638,882
  6. Step 6: Final answer
    x = 1,535,992.68

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.