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Finding the Third Proportional to 669 and 817.50

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Solution

The third proportional to 669 and 817.50 is: 998.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    669 : 817.50 = 817.50 : x
  2. Step 2: Convert to fraction form
    669/817.50 = 817.50/x
  3. Step 3: Cross multiply
    669x = 817.50 × 817.50
  4. Step 4: Simplify right side
    669x = 668,306.25
  5. Step 5: Solve for x
    x = 668,306.25/669
  6. Step 6: Final answer
    x = 998.96

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.