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Finding the Third Proportional to 299,439 and 687,238

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Solution

The third proportional to 299,439 and 687,238 is: 1,577,269.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,439 : 687,238 = 687,238 : x
  2. Step 2: Convert to fraction form
    299,439/687,238 = 687,238/x
  3. Step 3: Cross multiply
    299,439x = 687,238 × 687,238
  4. Step 4: Simplify right side
    299,439x = 472,296,068,644
  5. Step 5: Solve for x
    x = 472,296,068,644/299,439
  6. Step 6: Final answer
    x = 1,577,269.72

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Why These Related Problems?

These problems maintain the same ratio (2.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.