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Finding the Third Proportional to 15,136 and 16,720

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Solution

The third proportional to 15,136 and 16,720 is: 18,469.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,136 : 16,720 = 16,720 : x
  2. Step 2: Convert to fraction form
    15,136/16,720 = 16,720/x
  3. Step 3: Cross multiply
    15,136x = 16,720 × 16,720
  4. Step 4: Simplify right side
    15,136x = 279,558,400
  5. Step 5: Solve for x
    x = 279,558,400/15,136
  6. Step 6: Final answer
    x = 18,469.77

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.