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Finding the Third Proportional to 305.75 and 421

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Solution

The third proportional to 305.75 and 421 is: 579.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.75 : 421 = 421 : x
  2. Step 2: Convert to fraction form
    305.75/421 = 421/x
  3. Step 3: Cross multiply
    305.75x = 421 × 421
  4. Step 4: Simplify right side
    305.75x = 177,241
  5. Step 5: Solve for x
    x = 177,241/305.75
  6. Step 6: Final answer
    x = 579.69

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.