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Finding the Third Proportional to 2,159.75 and 3,121.75

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Solution

The third proportional to 2,159.75 and 3,121.75 is: 4,512.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.75 : 3,121.75 = 3,121.75 : x
  2. Step 2: Convert to fraction form
    2,159.75/3,121.75 = 3,121.75/x
  3. Step 3: Cross multiply
    2,159.75x = 3,121.75 × 3,121.75
  4. Step 4: Simplify right side
    2,159.75x = 9,745,323.06
  5. Step 5: Solve for x
    x = 9,745,323.06/2,159.75
  6. Step 6: Final answer
    x = 4,512.25

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.