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Finding the Third Proportional to 400.75 and 620.88

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Solution

The third proportional to 400.75 and 620.88 is: 961.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.75 : 620.88 = 620.88 : x
  2. Step 2: Convert to fraction form
    400.75/620.88 = 620.88/x
  3. Step 3: Cross multiply
    400.75x = 620.88 × 620.88
  4. Step 4: Simplify right side
    400.75x = 385,485.77
  5. Step 5: Solve for x
    x = 385,485.77/400.75
  6. Step 6: Final answer
    x = 961.91

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.