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Finding the Third Proportional to 1,388 and 2,821

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Solution

The third proportional to 1,388 and 2,821 is: 5,733.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388 : 2,821 = 2,821 : x
  2. Step 2: Convert to fraction form
    1,388/2,821 = 2,821/x
  3. Step 3: Cross multiply
    1,388x = 2,821 × 2,821
  4. Step 4: Simplify right side
    1,388x = 7,958,041
  5. Step 5: Solve for x
    x = 7,958,041/1,388
  6. Step 6: Final answer
    x = 5,733.46

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.