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Finding the Third Proportional to 612.75 and 630.75

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Solution

The third proportional to 612.75 and 630.75 is: 649.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.75 : 630.75 = 630.75 : x
  2. Step 2: Convert to fraction form
    612.75/630.75 = 630.75/x
  3. Step 3: Cross multiply
    612.75x = 630.75 × 630.75
  4. Step 4: Simplify right side
    612.75x = 397,845.56
  5. Step 5: Solve for x
    x = 397,845.56/612.75
  6. Step 6: Final answer
    x = 649.28

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Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.