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Finding the Third Proportional to 4,000 and 5,720

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Solution

The third proportional to 4,000 and 5,720 is: 8,179.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,000 : 5,720 = 5,720 : x
  2. Step 2: Convert to fraction form
    4,000/5,720 = 5,720/x
  3. Step 3: Cross multiply
    4,000x = 5,720 × 5,720
  4. Step 4: Simplify right side
    4,000x = 32,718,400
  5. Step 5: Solve for x
    x = 32,718,400/4,000
  6. Step 6: Final answer
    x = 8,179.60

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.