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Finding the Third Proportional to 988 and 1,286

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Solution

The third proportional to 988 and 1,286 is: 1,673.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    988 : 1,286 = 1,286 : x
  2. Step 2: Convert to fraction form
    988/1,286 = 1,286/x
  3. Step 3: Cross multiply
    988x = 1,286 × 1,286
  4. Step 4: Simplify right side
    988x = 1,653,796
  5. Step 5: Solve for x
    x = 1,653,796/988
  6. Step 6: Final answer
    x = 1,673.88

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.