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Finding the Third Proportional to 411.88 and 641.44

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Solution

The third proportional to 411.88 and 641.44 is: 998.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.88 : 641.44 = 641.44 : x
  2. Step 2: Convert to fraction form
    411.88/641.44 = 641.44/x
  3. Step 3: Cross multiply
    411.88x = 641.44 × 641.44
  4. Step 4: Simplify right side
    411.88x = 411,442.07
  5. Step 5: Solve for x
    x = 411,442.07/411.88
  6. Step 6: Final answer
    x = 998.95

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.