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Finding the Third Proportional to 520.50 and 821.25

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Solution

The third proportional to 520.50 and 821.25 is: 1,295.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.50 : 821.25 = 821.25 : x
  2. Step 2: Convert to fraction form
    520.50/821.25 = 821.25/x
  3. Step 3: Cross multiply
    520.50x = 821.25 × 821.25
  4. Step 4: Simplify right side
    520.50x = 674,451.56
  5. Step 5: Solve for x
    x = 674,451.56/520.50
  6. Step 6: Final answer
    x = 1,295.78

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.