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Finding the Third Proportional to 144.25 and 312.75

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Solution

The third proportional to 144.25 and 312.75 is: 678.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.25 : 312.75 = 312.75 : x
  2. Step 2: Convert to fraction form
    144.25/312.75 = 312.75/x
  3. Step 3: Cross multiply
    144.25x = 312.75 × 312.75
  4. Step 4: Simplify right side
    144.25x = 97,812.56
  5. Step 5: Solve for x
    x = 97,812.56/144.25
  6. Step 6: Final answer
    x = 678.08

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.