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Finding the Third Proportional to 618 and 1,331

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Solution

The third proportional to 618 and 1,331 is: 2,866.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    618 : 1,331 = 1,331 : x
  2. Step 2: Convert to fraction form
    618/1,331 = 1,331/x
  3. Step 3: Cross multiply
    618x = 1,331 × 1,331
  4. Step 4: Simplify right side
    618x = 1,771,561
  5. Step 5: Solve for x
    x = 1,771,561/618
  6. Step 6: Final answer
    x = 2,866.60

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.