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Finding the Third Proportional to 427.69 and 679.97

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Solution

The third proportional to 427.69 and 679.97 is: 1,081.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.69 : 679.97 = 679.97 : x
  2. Step 2: Convert to fraction form
    427.69/679.97 = 679.97/x
  3. Step 3: Cross multiply
    427.69x = 679.97 × 679.97
  4. Step 4: Simplify right side
    427.69x = 462,357.50
  5. Step 5: Solve for x
    x = 462,357.50/427.69
  6. Step 6: Final answer
    x = 1,081.06

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.