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Finding the Third Proportional to 12,356 and 15,910

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Solution

The third proportional to 12,356 and 15,910 is: 20,486.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,356 : 15,910 = 15,910 : x
  2. Step 2: Convert to fraction form
    12,356/15,910 = 15,910/x
  3. Step 3: Cross multiply
    12,356x = 15,910 × 15,910
  4. Step 4: Simplify right side
    12,356x = 253,128,100
  5. Step 5: Solve for x
    x = 253,128,100/12,356
  6. Step 6: Final answer
    x = 20,486.25

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.