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Finding the Third Proportional to 153.25 and 313.75

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Solution

The third proportional to 153.25 and 313.75 is: 642.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.25 : 313.75 = 313.75 : x
  2. Step 2: Convert to fraction form
    153.25/313.75 = 313.75/x
  3. Step 3: Cross multiply
    153.25x = 313.75 × 313.75
  4. Step 4: Simplify right side
    153.25x = 98,439.06
  5. Step 5: Solve for x
    x = 98,439.06/153.25
  6. Step 6: Final answer
    x = 642.34

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.