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Finding the Third Proportional to 1,398 and 1,778

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Solution

The third proportional to 1,398 and 1,778 is: 2,261.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398 : 1,778 = 1,778 : x
  2. Step 2: Convert to fraction form
    1,398/1,778 = 1,778/x
  3. Step 3: Cross multiply
    1,398x = 1,778 × 1,778
  4. Step 4: Simplify right side
    1,398x = 3,161,284
  5. Step 5: Solve for x
    x = 3,161,284/1,398
  6. Step 6: Final answer
    x = 2,261.29

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.