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Finding the Third Proportional to 485 and 622.25

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Solution

The third proportional to 485 and 622.25 is: 798.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    485 : 622.25 = 622.25 : x
  2. Step 2: Convert to fraction form
    485/622.25 = 622.25/x
  3. Step 3: Cross multiply
    485x = 622.25 × 622.25
  4. Step 4: Simplify right side
    485x = 387,195.06
  5. Step 5: Solve for x
    x = 387,195.06/485
  6. Step 6: Final answer
    x = 798.34

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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.