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Finding the Third Proportional to 8,420 and 18,220

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Solution

The third proportional to 8,420 and 18,220 is: 39,426.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420 : 18,220 = 18,220 : x
  2. Step 2: Convert to fraction form
    8,420/18,220 = 18,220/x
  3. Step 3: Cross multiply
    8,420x = 18,220 × 18,220
  4. Step 4: Simplify right side
    8,420x = 331,968,400
  5. Step 5: Solve for x
    x = 331,968,400/8,420
  6. Step 6: Final answer
    x = 39,426.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.