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Finding the Third Proportional to 505.25 and 680.75

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Solution

The third proportional to 505.25 and 680.75 is: 917.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.25 : 680.75 = 680.75 : x
  2. Step 2: Convert to fraction form
    505.25/680.75 = 680.75/x
  3. Step 3: Cross multiply
    505.25x = 680.75 × 680.75
  4. Step 4: Simplify right side
    505.25x = 463,420.56
  5. Step 5: Solve for x
    x = 463,420.56/505.25
  6. Step 6: Final answer
    x = 917.21

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.