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Finding the Third Proportional to 421.41 and 628.31

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Solution

The third proportional to 421.41 and 628.31 is: 936.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.41 : 628.31 = 628.31 : x
  2. Step 2: Convert to fraction form
    421.41/628.31 = 628.31/x
  3. Step 3: Cross multiply
    421.41x = 628.31 × 628.31
  4. Step 4: Simplify right side
    421.41x = 394,776.60
  5. Step 5: Solve for x
    x = 394,776.60/421.41
  6. Step 6: Final answer
    x = 936.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.