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Finding the Third Proportional to 15,280 and 16,720

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Solution

The third proportional to 15,280 and 16,720 is: 18,295.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,280 : 16,720 = 16,720 : x
  2. Step 2: Convert to fraction form
    15,280/16,720 = 16,720/x
  3. Step 3: Cross multiply
    15,280x = 16,720 × 16,720
  4. Step 4: Simplify right side
    15,280x = 279,558,400
  5. Step 5: Solve for x
    x = 279,558,400/15,280
  6. Step 6: Final answer
    x = 18,295.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.