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Finding the Third Proportional to 4,220 and 8,120

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Solution

The third proportional to 4,220 and 8,120 is: 15,624.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,220 : 8,120 = 8,120 : x
  2. Step 2: Convert to fraction form
    4,220/8,120 = 8,120/x
  3. Step 3: Cross multiply
    4,220x = 8,120 × 8,120
  4. Step 4: Simplify right side
    4,220x = 65,934,400
  5. Step 5: Solve for x
    x = 65,934,400/4,220
  6. Step 6: Final answer
    x = 15,624.27

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Why These Related Problems?

These problems maintain the same ratio (1.92) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.