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Finding the Third Proportional to 12,420 and 17,691.75

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Solution

The third proportional to 12,420 and 17,691.75 is: 25,201.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420 : 17,691.75 = 17,691.75 : x
  2. Step 2: Convert to fraction form
    12,420/17,691.75 = 17,691.75/x
  3. Step 3: Cross multiply
    12,420x = 17,691.75 × 17,691.75
  4. Step 4: Simplify right side
    12,420x = 312,998,018.06
  5. Step 5: Solve for x
    x = 312,998,018.06/12,420
  6. Step 6: Final answer
    x = 25,201.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.