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Finding the Third Proportional to 1,285 and 2,630

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Solution

The third proportional to 1,285 and 2,630 is: 5,382.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285 : 2,630 = 2,630 : x
  2. Step 2: Convert to fraction form
    1,285/2,630 = 2,630/x
  3. Step 3: Cross multiply
    1,285x = 2,630 × 2,630
  4. Step 4: Simplify right side
    1,285x = 6,916,900
  5. Step 5: Solve for x
    x = 6,916,900/1,285
  6. Step 6: Final answer
    x = 5,382.80

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.