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Finding the Third Proportional to 418.13 and 620.81

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Solution

The third proportional to 418.13 and 620.81 is: 921.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.13 : 620.81 = 620.81 : x
  2. Step 2: Convert to fraction form
    418.13/620.81 = 620.81/x
  3. Step 3: Cross multiply
    418.13x = 620.81 × 620.81
  4. Step 4: Simplify right side
    418.13x = 385,408.16
  5. Step 5: Solve for x
    x = 385,408.16/418.13
  6. Step 6: Final answer
    x = 921.75

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.