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Finding the Third Proportional to 2,690 and 3,809.50

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Solution

The third proportional to 2,690 and 3,809.50 is: 5,394.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690 : 3,809.50 = 3,809.50 : x
  2. Step 2: Convert to fraction form
    2,690/3,809.50 = 3,809.50/x
  3. Step 3: Cross multiply
    2,690x = 3,809.50 × 3,809.50
  4. Step 4: Simplify right side
    2,690x = 14,512,290.25
  5. Step 5: Solve for x
    x = 14,512,290.25/2,690
  6. Step 6: Final answer
    x = 5,394.90

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.