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Finding the Third Proportional to 18,216 and 39,690

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Solution

The third proportional to 18,216 and 39,690 is: 86,478.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,216 : 39,690 = 39,690 : x
  2. Step 2: Convert to fraction form
    18,216/39,690 = 39,690/x
  3. Step 3: Cross multiply
    18,216x = 39,690 × 39,690
  4. Step 4: Simplify right side
    18,216x = 1,575,296,100
  5. Step 5: Solve for x
    x = 1,575,296,100/18,216
  6. Step 6: Final answer
    x = 86,478.71

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.