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Finding the Third Proportional to 1,821 and 4,380

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Solution

The third proportional to 1,821 and 4,380 is: 10,535.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821 : 4,380 = 4,380 : x
  2. Step 2: Convert to fraction form
    1,821/4,380 = 4,380/x
  3. Step 3: Cross multiply
    1,821x = 4,380 × 4,380
  4. Step 4: Simplify right side
    1,821x = 19,184,400
  5. Step 5: Solve for x
    x = 19,184,400/1,821
  6. Step 6: Final answer
    x = 10,535.09

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Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.