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Finding the Third Proportional to 251.06 and 400.69

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Solution

The third proportional to 251.06 and 400.69 is: 639.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.06 : 400.69 = 400.69 : x
  2. Step 2: Convert to fraction form
    251.06/400.69 = 400.69/x
  3. Step 3: Cross multiply
    251.06x = 400.69 × 400.69
  4. Step 4: Simplify right side
    251.06x = 160,550.47
  5. Step 5: Solve for x
    x = 160,550.47/251.06
  6. Step 6: Final answer
    x = 639.48

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.