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Finding the Third Proportional to 486 and 821.25

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Solution

The third proportional to 486 and 821.25 is: 1,387.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    486 : 821.25 = 821.25 : x
  2. Step 2: Convert to fraction form
    486/821.25 = 821.25/x
  3. Step 3: Cross multiply
    486x = 821.25 × 821.25
  4. Step 4: Simplify right side
    486x = 674,451.56
  5. Step 5: Solve for x
    x = 674,451.56/486
  6. Step 6: Final answer
    x = 1,387.76

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Why These Related Problems?

These problems maintain the same ratio (1.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.