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Finding the Third Proportional to 319,980 and 687,447

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Solution

The third proportional to 319,980 and 687,447 is: 1,476,915.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,980 : 687,447 = 687,447 : x
  2. Step 2: Convert to fraction form
    319,980/687,447 = 687,447/x
  3. Step 3: Cross multiply
    319,980x = 687,447 × 687,447
  4. Step 4: Simplify right side
    319,980x = 472,583,377,809
  5. Step 5: Solve for x
    x = 472,583,377,809/319,980
  6. Step 6: Final answer
    x = 1,476,915.36

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.