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Finding the Third Proportional to 408 and 580

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Solution

The third proportional to 408 and 580 is: 824.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    408 : 580 = 580 : x
  2. Step 2: Convert to fraction form
    408/580 = 580/x
  3. Step 3: Cross multiply
    408x = 580 × 580
  4. Step 4: Simplify right side
    408x = 336,400
  5. Step 5: Solve for x
    x = 336,400/408
  6. Step 6: Final answer
    x = 824.51

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These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.