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Finding the Third Proportional to 872.50 and 1,919

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Solution

The third proportional to 872.50 and 1,919 is: 4,220.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.50 : 1,919 = 1,919 : x
  2. Step 2: Convert to fraction form
    872.50/1,919 = 1,919/x
  3. Step 3: Cross multiply
    872.50x = 1,919 × 1,919
  4. Step 4: Simplify right side
    872.50x = 3,682,561
  5. Step 5: Solve for x
    x = 3,682,561/872.50
  6. Step 6: Final answer
    x = 4,220.70

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.