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Finding the Third Proportional to 505.75 and 648.25

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Solution

The third proportional to 505.75 and 648.25 is: 830.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.75 : 648.25 = 648.25 : x
  2. Step 2: Convert to fraction form
    505.75/648.25 = 648.25/x
  3. Step 3: Cross multiply
    505.75x = 648.25 × 648.25
  4. Step 4: Simplify right side
    505.75x = 420,228.06
  5. Step 5: Solve for x
    x = 420,228.06/505.75
  6. Step 6: Final answer
    x = 830.90

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.