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Finding the Third Proportional to 308 and 393.25

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Solution

The third proportional to 308 and 393.25 is: 502.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    308 : 393.25 = 393.25 : x
  2. Step 2: Convert to fraction form
    308/393.25 = 393.25/x
  3. Step 3: Cross multiply
    308x = 393.25 × 393.25
  4. Step 4: Simplify right side
    308x = 154,645.56
  5. Step 5: Solve for x
    x = 154,645.56/308
  6. Step 6: Final answer
    x = 502.10

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.