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Finding the Third Proportional to 136.75 and 291.25

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Solution

The third proportional to 136.75 and 291.25 is: 620.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.75 : 291.25 = 291.25 : x
  2. Step 2: Convert to fraction form
    136.75/291.25 = 291.25/x
  3. Step 3: Cross multiply
    136.75x = 291.25 × 291.25
  4. Step 4: Simplify right side
    136.75x = 84,826.56
  5. Step 5: Solve for x
    x = 84,826.56/136.75
  6. Step 6: Final answer
    x = 620.30

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.