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Finding the Third Proportional to 421.69 and 852.38

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Solution

The third proportional to 421.69 and 852.38 is: 1,722.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.69 : 852.38 = 852.38 : x
  2. Step 2: Convert to fraction form
    421.69/852.38 = 852.38/x
  3. Step 3: Cross multiply
    421.69x = 852.38 × 852.38
  4. Step 4: Simplify right side
    421.69x = 726,543.14
  5. Step 5: Solve for x
    x = 726,543.14/421.69
  6. Step 6: Final answer
    x = 1,722.94

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.