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Finding the Third Proportional to 290.25 and 625.69

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Solution

The third proportional to 290.25 and 625.69 is: 1,348.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.25 : 625.69 = 625.69 : x
  2. Step 2: Convert to fraction form
    290.25/625.69 = 625.69/x
  3. Step 3: Cross multiply
    290.25x = 625.69 × 625.69
  4. Step 4: Simplify right side
    290.25x = 391,484.85
  5. Step 5: Solve for x
    x = 391,484.85/290.25
  6. Step 6: Final answer
    x = 1,348.79

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Why These Related Problems?

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