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Finding the Third Proportional to 11,905 and 15,657

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Solution

The third proportional to 11,905 and 15,657 is: 20,591.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,905 : 15,657 = 15,657 : x
  2. Step 2: Convert to fraction form
    11,905/15,657 = 15,657/x
  3. Step 3: Cross multiply
    11,905x = 15,657 × 15,657
  4. Step 4: Simplify right side
    11,905x = 245,141,649
  5. Step 5: Solve for x
    x = 245,141,649/11,905
  6. Step 6: Final answer
    x = 20,591.49

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.