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Finding the Third Proportional to 1,291 and 1,942

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Solution

The third proportional to 1,291 and 1,942 is: 2,921.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291 : 1,942 = 1,942 : x
  2. Step 2: Convert to fraction form
    1,291/1,942 = 1,942/x
  3. Step 3: Cross multiply
    1,291x = 1,942 × 1,942
  4. Step 4: Simplify right side
    1,291x = 3,771,364
  5. Step 5: Solve for x
    x = 3,771,364/1,291
  6. Step 6: Final answer
    x = 2,921.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.