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Finding the Third Proportional to 30,790 and 66,289

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Solution

The third proportional to 30,790 and 66,289 is: 142,716.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,790 : 66,289 = 66,289 : x
  2. Step 2: Convert to fraction form
    30,790/66,289 = 66,289/x
  3. Step 3: Cross multiply
    30,790x = 66,289 × 66,289
  4. Step 4: Simplify right side
    30,790x = 4,394,231,521
  5. Step 5: Solve for x
    x = 4,394,231,521/30,790
  6. Step 6: Final answer
    x = 142,716.19

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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.