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Finding the Third Proportional to 18,265.50 and 21,690

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Solution

The third proportional to 18,265.50 and 21,690 is: 25,756.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,265.50 : 21,690 = 21,690 : x
  2. Step 2: Convert to fraction form
    18,265.50/21,690 = 21,690/x
  3. Step 3: Cross multiply
    18,265.50x = 21,690 × 21,690
  4. Step 4: Simplify right side
    18,265.50x = 470,456,100
  5. Step 5: Solve for x
    x = 470,456,100/18,265.50
  6. Step 6: Final answer
    x = 25,756.54

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Why These Related Problems?

These problems maintain the same ratio (1.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.