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Finding the Third Proportional to 825 and 2,118

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Solution

The third proportional to 825 and 2,118 is: 5,437.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    825 : 2,118 = 2,118 : x
  2. Step 2: Convert to fraction form
    825/2,118 = 2,118/x
  3. Step 3: Cross multiply
    825x = 2,118 × 2,118
  4. Step 4: Simplify right side
    825x = 4,485,924
  5. Step 5: Solve for x
    x = 4,485,924/825
  6. Step 6: Final answer
    x = 5,437.48

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Why These Related Problems?

These problems maintain the same ratio (2.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.