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Finding the Third Proportional to 618 and 684.75

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Solution

The third proportional to 618 and 684.75 is: 758.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    618 : 684.75 = 684.75 : x
  2. Step 2: Convert to fraction form
    618/684.75 = 684.75/x
  3. Step 3: Cross multiply
    618x = 684.75 × 684.75
  4. Step 4: Simplify right side
    618x = 468,882.56
  5. Step 5: Solve for x
    x = 468,882.56/618
  6. Step 6: Final answer
    x = 758.71

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.