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Finding the Third Proportional to 2,142 and 2,679.75

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Solution

The third proportional to 2,142 and 2,679.75 is: 3,352.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142 : 2,679.75 = 2,679.75 : x
  2. Step 2: Convert to fraction form
    2,142/2,679.75 = 2,679.75/x
  3. Step 3: Cross multiply
    2,142x = 2,679.75 × 2,679.75
  4. Step 4: Simplify right side
    2,142x = 7,181,060.06
  5. Step 5: Solve for x
    x = 7,181,060.06/2,142
  6. Step 6: Final answer
    x = 3,352.50

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Why These Related Problems?

These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.