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Finding the Third Proportional to 18,128 and 39,818

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Solution

The third proportional to 18,128 and 39,818 is: 87,459.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,128 : 39,818 = 39,818 : x
  2. Step 2: Convert to fraction form
    18,128/39,818 = 39,818/x
  3. Step 3: Cross multiply
    18,128x = 39,818 × 39,818
  4. Step 4: Simplify right side
    18,128x = 1,585,473,124
  5. Step 5: Solve for x
    x = 1,585,473,124/18,128
  6. Step 6: Final answer
    x = 87,459.90

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.