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Finding the Third Proportional to 8,190 and 12,685

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Solution

The third proportional to 8,190 and 12,685 is: 19,647.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,190 : 12,685 = 12,685 : x
  2. Step 2: Convert to fraction form
    8,190/12,685 = 12,685/x
  3. Step 3: Cross multiply
    8,190x = 12,685 × 12,685
  4. Step 4: Simplify right side
    8,190x = 160,909,225
  5. Step 5: Solve for x
    x = 160,909,225/8,190
  6. Step 6: Final answer
    x = 19,647.04

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.