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Finding the Third Proportional to 528 and 581

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Solution

The third proportional to 528 and 581 is: 639.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    528 : 581 = 581 : x
  2. Step 2: Convert to fraction form
    528/581 = 581/x
  3. Step 3: Cross multiply
    528x = 581 × 581
  4. Step 4: Simplify right side
    528x = 337,561
  5. Step 5: Solve for x
    x = 337,561/528
  6. Step 6: Final answer
    x = 639.32

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.