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Finding the Third Proportional to 414,538 and 640,128

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Solution

The third proportional to 414,538 and 640,128 is: 988,483.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    414,538 : 640,128 = 640,128 : x
  2. Step 2: Convert to fraction form
    414,538/640,128 = 640,128/x
  3. Step 3: Cross multiply
    414,538x = 640,128 × 640,128
  4. Step 4: Simplify right side
    414,538x = 409,763,856,384
  5. Step 5: Solve for x
    x = 409,763,856,384/414,538
  6. Step 6: Final answer
    x = 988,483.22

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.