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Finding the Third Proportional to 581 and 631

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Solution

The third proportional to 581 and 631 is: 685.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    581 : 631 = 631 : x
  2. Step 2: Convert to fraction form
    581/631 = 631/x
  3. Step 3: Cross multiply
    581x = 631 × 631
  4. Step 4: Simplify right side
    581x = 398,161
  5. Step 5: Solve for x
    x = 398,161/581
  6. Step 6: Final answer
    x = 685.30

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.