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Finding the Third Proportional to 379.69 and 820.13

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Solution

The third proportional to 379.69 and 820.13 is: 1,771.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.69 : 820.13 = 820.13 : x
  2. Step 2: Convert to fraction form
    379.69/820.13 = 820.13/x
  3. Step 3: Cross multiply
    379.69x = 820.13 × 820.13
  4. Step 4: Simplify right side
    379.69x = 672,605.02
  5. Step 5: Solve for x
    x = 672,605.02/379.69
  6. Step 6: Final answer
    x = 1,771.47

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.