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Finding the Third Proportional to 400.88 and 689.44

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Solution

The third proportional to 400.88 and 689.44 is: 1,185.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.88 : 689.44 = 689.44 : x
  2. Step 2: Convert to fraction form
    400.88/689.44 = 689.44/x
  3. Step 3: Cross multiply
    400.88x = 689.44 × 689.44
  4. Step 4: Simplify right side
    400.88x = 475,324.07
  5. Step 5: Solve for x
    x = 475,324.07/400.88
  6. Step 6: Final answer
    x = 1,185.72

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Why These Related Problems?

These problems maintain the same ratio (1.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.