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Finding the Third Proportional to 149,820 and 321,874

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Solution

The third proportional to 149,820 and 321,874 is: 691,515.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,820 : 321,874 = 321,874 : x
  2. Step 2: Convert to fraction form
    149,820/321,874 = 321,874/x
  3. Step 3: Cross multiply
    149,820x = 321,874 × 321,874
  4. Step 4: Simplify right side
    149,820x = 103,602,871,876
  5. Step 5: Solve for x
    x = 103,602,871,876/149,820
  6. Step 6: Final answer
    x = 691,515.63

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.