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Finding the Third Proportional to 487 and 559

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Solution

The third proportional to 487 and 559 is: 641.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    487 : 559 = 559 : x
  2. Step 2: Convert to fraction form
    487/559 = 559/x
  3. Step 3: Cross multiply
    487x = 559 × 559
  4. Step 4: Simplify right side
    487x = 312,481
  5. Step 5: Solve for x
    x = 312,481/487
  6. Step 6: Final answer
    x = 641.64

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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.