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Finding the Third Proportional to 426.75 and 620.81

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Solution

The third proportional to 426.75 and 620.81 is: 903.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.75 : 620.81 = 620.81 : x
  2. Step 2: Convert to fraction form
    426.75/620.81 = 620.81/x
  3. Step 3: Cross multiply
    426.75x = 620.81 × 620.81
  4. Step 4: Simplify right side
    426.75x = 385,408.16
  5. Step 5: Solve for x
    x = 385,408.16/426.75
  6. Step 6: Final answer
    x = 903.12

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.