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Finding the Third Proportional to 290.25 and 442.75

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Solution

The third proportional to 290.25 and 442.75 is: 675.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.25 : 442.75 = 442.75 : x
  2. Step 2: Convert to fraction form
    290.25/442.75 = 442.75/x
  3. Step 3: Cross multiply
    290.25x = 442.75 × 442.75
  4. Step 4: Simplify right side
    290.25x = 196,027.56
  5. Step 5: Solve for x
    x = 196,027.56/290.25
  6. Step 6: Final answer
    x = 675.37

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.