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Finding the Third Proportional to 328 and 820

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Solution

The third proportional to 328 and 820 is: 2,050

Step by Step Solution

  1. Step 1: Write the proportion equation
    328 : 820 = 820 : x
  2. Step 2: Convert to fraction form
    328/820 = 820/x
  3. Step 3: Cross multiply
    328x = 820 × 820
  4. Step 4: Simplify right side
    328x = 672,400
  5. Step 5: Solve for x
    x = 672,400/328
  6. Step 6: Final answer
    x = 2,050

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Why These Related Problems?

These problems maintain the same ratio (2.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.