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Finding the Third Proportional to 211,478 and 311,375

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Solution

The third proportional to 211,478 and 311,375 is: 458,460.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,478 : 311,375 = 311,375 : x
  2. Step 2: Convert to fraction form
    211,478/311,375 = 311,375/x
  3. Step 3: Cross multiply
    211,478x = 311,375 × 311,375
  4. Step 4: Simplify right side
    211,478x = 96,954,390,625
  5. Step 5: Solve for x
    x = 96,954,390,625/211,478
  6. Step 6: Final answer
    x = 458,460.88

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.