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Finding the Third Proportional to 15,870 and 25,170

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Solution

The third proportional to 15,870 and 25,170 is: 39,919.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870 : 25,170 = 25,170 : x
  2. Step 2: Convert to fraction form
    15,870/25,170 = 25,170/x
  3. Step 3: Cross multiply
    15,870x = 25,170 × 25,170
  4. Step 4: Simplify right side
    15,870x = 633,528,900
  5. Step 5: Solve for x
    x = 633,528,900/15,870
  6. Step 6: Final answer
    x = 39,919.91

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.