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Finding the Third Proportional to 1,278.75 and 2,988.38

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Solution

The third proportional to 1,278.75 and 2,988.38 is: 6,983.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.75 : 2,988.38 = 2,988.38 : x
  2. Step 2: Convert to fraction form
    1,278.75/2,988.38 = 2,988.38/x
  3. Step 3: Cross multiply
    1,278.75x = 2,988.38 × 2,988.38
  4. Step 4: Simplify right side
    1,278.75x = 8,930,385.14
  5. Step 5: Solve for x
    x = 8,930,385.14/1,278.75
  6. Step 6: Final answer
    x = 6,983.68

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Why These Related Problems?

These problems maintain the same ratio (2.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.