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Finding the Third Proportional to 1,221 and 2,658

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Solution

The third proportional to 1,221 and 2,658 is: 5,786.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221 : 2,658 = 2,658 : x
  2. Step 2: Convert to fraction form
    1,221/2,658 = 2,658/x
  3. Step 3: Cross multiply
    1,221x = 2,658 × 2,658
  4. Step 4: Simplify right side
    1,221x = 7,064,964
  5. Step 5: Solve for x
    x = 7,064,964/1,221
  6. Step 6: Final answer
    x = 5,786.21

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.