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Finding the Third Proportional to 589 and 641.50

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Solution

The third proportional to 589 and 641.50 is: 698.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    589 : 641.50 = 641.50 : x
  2. Step 2: Convert to fraction form
    589/641.50 = 641.50/x
  3. Step 3: Cross multiply
    589x = 641.50 × 641.50
  4. Step 4: Simplify right side
    589x = 411,522.25
  5. Step 5: Solve for x
    x = 411,522.25/589
  6. Step 6: Final answer
    x = 698.68

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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.