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Finding the Third Proportional to 15,400 and 17,640

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Solution

The third proportional to 15,400 and 17,640 is: 20,205.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,400 : 17,640 = 17,640 : x
  2. Step 2: Convert to fraction form
    15,400/17,640 = 17,640/x
  3. Step 3: Cross multiply
    15,400x = 17,640 × 17,640
  4. Step 4: Simplify right side
    15,400x = 311,169,600
  5. Step 5: Solve for x
    x = 311,169,600/15,400
  6. Step 6: Final answer
    x = 20,205.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.