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Finding the Third Proportional to 1,218.80 and 2,919.80

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Solution

The third proportional to 1,218.80 and 2,919.80 is: 6,994.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.80 : 2,919.80 = 2,919.80 : x
  2. Step 2: Convert to fraction form
    1,218.80/2,919.80 = 2,919.80/x
  3. Step 3: Cross multiply
    1,218.80x = 2,919.80 × 2,919.80
  4. Step 4: Simplify right side
    1,218.80x = 8,525,213.79
  5. Step 5: Solve for x
    x = 8,525,213.79/1,218.80
  6. Step 6: Final answer
    x = 6,994.78

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Why These Related Problems?

These problems maintain the same ratio (2.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.