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Finding the Third Proportional to 1,291 and 1,918

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Solution

The third proportional to 1,291 and 1,918 is: 2,849.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291 : 1,918 = 1,918 : x
  2. Step 2: Convert to fraction form
    1,291/1,918 = 1,918/x
  3. Step 3: Cross multiply
    1,291x = 1,918 × 1,918
  4. Step 4: Simplify right side
    1,291x = 3,678,724
  5. Step 5: Solve for x
    x = 3,678,724/1,291
  6. Step 6: Final answer
    x = 2,849.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.