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Finding the Third Proportional to 15,656 and 17,128

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Solution

The third proportional to 15,656 and 17,128 is: 18,738.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,656 : 17,128 = 17,128 : x
  2. Step 2: Convert to fraction form
    15,656/17,128 = 17,128/x
  3. Step 3: Cross multiply
    15,656x = 17,128 × 17,128
  4. Step 4: Simplify right side
    15,656x = 293,368,384
  5. Step 5: Solve for x
    x = 293,368,384/15,656
  6. Step 6: Final answer
    x = 18,738.40

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.