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Finding the Third Proportional to 278.75 and 609.25

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Solution

The third proportional to 278.75 and 609.25 is: 1,331.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.75 : 609.25 = 609.25 : x
  2. Step 2: Convert to fraction form
    278.75/609.25 = 609.25/x
  3. Step 3: Cross multiply
    278.75x = 609.25 × 609.25
  4. Step 4: Simplify right side
    278.75x = 371,185.56
  5. Step 5: Solve for x
    x = 371,185.56/278.75
  6. Step 6: Final answer
    x = 1,331.61

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.