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Finding the Third Proportional to 319,988 and 687,420

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Solution

The third proportional to 319,988 and 687,420 is: 1,476,762.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,988 : 687,420 = 687,420 : x
  2. Step 2: Convert to fraction form
    319,988/687,420 = 687,420/x
  3. Step 3: Cross multiply
    319,988x = 687,420 × 687,420
  4. Step 4: Simplify right side
    319,988x = 472,546,256,400
  5. Step 5: Solve for x
    x = 472,546,256,400/319,988
  6. Step 6: Final answer
    x = 1,476,762.43

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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.