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Finding the Third Proportional to 311,208 and 665,040

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Solution

The third proportional to 311,208 and 665,040 is: 1,421,165.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,208 : 665,040 = 665,040 : x
  2. Step 2: Convert to fraction form
    311,208/665,040 = 665,040/x
  3. Step 3: Cross multiply
    311,208x = 665,040 × 665,040
  4. Step 4: Simplify right side
    311,208x = 442,278,201,600
  5. Step 5: Solve for x
    x = 442,278,201,600/311,208
  6. Step 6: Final answer
    x = 1,421,165.91

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.