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Finding the Third Proportional to 490.13 and 620.63

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Solution

The third proportional to 490.13 and 620.63 is: 785.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.13 : 620.63 = 620.63 : x
  2. Step 2: Convert to fraction form
    490.13/620.63 = 620.63/x
  3. Step 3: Cross multiply
    490.13x = 620.63 × 620.63
  4. Step 4: Simplify right side
    490.13x = 385,175.39
  5. Step 5: Solve for x
    x = 385,175.39/490.13
  6. Step 6: Final answer
    x = 785.87

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.