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Finding the Third Proportional to 308.25 and 457.75

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Solution

The third proportional to 308.25 and 457.75 is: 679.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.25 : 457.75 = 457.75 : x
  2. Step 2: Convert to fraction form
    308.25/457.75 = 457.75/x
  3. Step 3: Cross multiply
    308.25x = 457.75 × 457.75
  4. Step 4: Simplify right side
    308.25x = 209,535.06
  5. Step 5: Solve for x
    x = 209,535.06/308.25
  6. Step 6: Final answer
    x = 679.76

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.