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Finding the Third Proportional to 8,242 and 12,420

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Solution

The third proportional to 8,242 and 12,420 is: 18,715.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,242 : 12,420 = 12,420 : x
  2. Step 2: Convert to fraction form
    8,242/12,420 = 12,420/x
  3. Step 3: Cross multiply
    8,242x = 12,420 × 12,420
  4. Step 4: Simplify right side
    8,242x = 154,256,400
  5. Step 5: Solve for x
    x = 154,256,400/8,242
  6. Step 6: Final answer
    x = 18,715.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.