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Finding the Third Proportional to 61,687 and 128,220

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Solution

The third proportional to 61,687 and 128,220 is: 266,512.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,687 : 128,220 = 128,220 : x
  2. Step 2: Convert to fraction form
    61,687/128,220 = 128,220/x
  3. Step 3: Cross multiply
    61,687x = 128,220 × 128,220
  4. Step 4: Simplify right side
    61,687x = 16,440,368,400
  5. Step 5: Solve for x
    x = 16,440,368,400/61,687
  6. Step 6: Final answer
    x = 266,512.69

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.