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Finding the Third Proportional to 290,403 and 439,983

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Solution

The third proportional to 290,403 and 439,983 is: 666,608.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,403 : 439,983 = 439,983 : x
  2. Step 2: Convert to fraction form
    290,403/439,983 = 439,983/x
  3. Step 3: Cross multiply
    290,403x = 439,983 × 439,983
  4. Step 4: Simplify right side
    290,403x = 193,585,040,289
  5. Step 5: Solve for x
    x = 193,585,040,289/290,403
  6. Step 6: Final answer
    x = 666,608.27

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.