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Finding the Third Proportional to 142.75 and 308

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Solution

The third proportional to 142.75 and 308 is: 664.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.75 : 308 = 308 : x
  2. Step 2: Convert to fraction form
    142.75/308 = 308/x
  3. Step 3: Cross multiply
    142.75x = 308 × 308
  4. Step 4: Simplify right side
    142.75x = 94,864
  5. Step 5: Solve for x
    x = 94,864/142.75
  6. Step 6: Final answer
    x = 664.55

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These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.