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Finding the Third Proportional to 398 and 571

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Solution

The third proportional to 398 and 571 is: 819.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398 : 571 = 571 : x
  2. Step 2: Convert to fraction form
    398/571 = 571/x
  3. Step 3: Cross multiply
    398x = 571 × 571
  4. Step 4: Simplify right side
    398x = 326,041
  5. Step 5: Solve for x
    x = 326,041/398
  6. Step 6: Final answer
    x = 819.20

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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.