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Finding the Third Proportional to 409,987 and 900,690

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Solution

The third proportional to 409,987 and 900,690 is: 1,978,702.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,987 : 900,690 = 900,690 : x
  2. Step 2: Convert to fraction form
    409,987/900,690 = 900,690/x
  3. Step 3: Cross multiply
    409,987x = 900,690 × 900,690
  4. Step 4: Simplify right side
    409,987x = 811,242,476,100
  5. Step 5: Solve for x
    x = 811,242,476,100/409,987
  6. Step 6: Final answer
    x = 1,978,702.92

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.