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Finding the Third Proportional to 85,128 and 172,688

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Solution

The third proportional to 85,128 and 172,688 is: 350,309.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,128 : 172,688 = 172,688 : x
  2. Step 2: Convert to fraction form
    85,128/172,688 = 172,688/x
  3. Step 3: Cross multiply
    85,128x = 172,688 × 172,688
  4. Step 4: Simplify right side
    85,128x = 29,821,145,344
  5. Step 5: Solve for x
    x = 29,821,145,344/85,128
  6. Step 6: Final answer
    x = 350,309.48

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.