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Finding the Third Proportional to 7,136 and 8,720

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Solution

The third proportional to 7,136 and 8,720 is: 10,655.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,136 : 8,720 = 8,720 : x
  2. Step 2: Convert to fraction form
    7,136/8,720 = 8,720/x
  3. Step 3: Cross multiply
    7,136x = 8,720 × 8,720
  4. Step 4: Simplify right side
    7,136x = 76,038,400
  5. Step 5: Solve for x
    x = 76,038,400/7,136
  6. Step 6: Final answer
    x = 10,655.61

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.