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Finding the Third Proportional to 290,289 and 439,809

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Solution

The third proportional to 290,289 and 439,809 is: 666,342.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,289 : 439,809 = 439,809 : x
  2. Step 2: Convert to fraction form
    290,289/439,809 = 439,809/x
  3. Step 3: Cross multiply
    290,289x = 439,809 × 439,809
  4. Step 4: Simplify right side
    290,289x = 193,431,956,481
  5. Step 5: Solve for x
    x = 193,431,956,481/290,289
  6. Step 6: Final answer
    x = 666,342.70

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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.