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Finding the Third Proportional to 20,855 and 31,170

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Solution

The third proportional to 20,855 and 31,170 is: 46,586.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855 : 31,170 = 31,170 : x
  2. Step 2: Convert to fraction form
    20,855/31,170 = 31,170/x
  3. Step 3: Cross multiply
    20,855x = 31,170 × 31,170
  4. Step 4: Simplify right side
    20,855x = 971,568,900
  5. Step 5: Solve for x
    x = 971,568,900/20,855
  6. Step 6: Final answer
    x = 46,586.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.