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Finding the Third Proportional to 1,381 and 2,978

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Solution

The third proportional to 1,381 and 2,978 is: 6,421.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381 : 2,978 = 2,978 : x
  2. Step 2: Convert to fraction form
    1,381/2,978 = 2,978/x
  3. Step 3: Cross multiply
    1,381x = 2,978 × 2,978
  4. Step 4: Simplify right side
    1,381x = 8,868,484
  5. Step 5: Solve for x
    x = 8,868,484/1,381
  6. Step 6: Final answer
    x = 6,421.78

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.