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Finding the Third Proportional to 128,422 and 170,402

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Solution

The third proportional to 128,422 and 170,402 is: 226,104.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,422 : 170,402 = 170,402 : x
  2. Step 2: Convert to fraction form
    128,422/170,402 = 170,402/x
  3. Step 3: Cross multiply
    128,422x = 170,402 × 170,402
  4. Step 4: Simplify right side
    128,422x = 29,036,841,604
  5. Step 5: Solve for x
    x = 29,036,841,604/128,422
  6. Step 6: Final answer
    x = 226,104.89

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.