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Finding the Third Proportional to 2,020.78 and 3,120.19

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Solution

The third proportional to 2,020.78 and 3,120.19 is: 4,817.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,020.78 : 3,120.19 = 3,120.19 : x
  2. Step 2: Convert to fraction form
    2,020.78/3,120.19 = 3,120.19/x
  3. Step 3: Cross multiply
    2,020.78x = 3,120.19 × 3,120.19
  4. Step 4: Simplify right side
    2,020.78x = 9,735,570.04
  5. Step 5: Solve for x
    x = 9,735,570.04/2,020.78
  6. Step 6: Final answer
    x = 4,817.73

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.