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Finding the Third Proportional to 307.50 and 489.25

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Solution

The third proportional to 307.50 and 489.25 is: 778.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.50 : 489.25 = 489.25 : x
  2. Step 2: Convert to fraction form
    307.50/489.25 = 489.25/x
  3. Step 3: Cross multiply
    307.50x = 489.25 × 489.25
  4. Step 4: Simplify right side
    307.50x = 239,365.56
  5. Step 5: Solve for x
    x = 239,365.56/307.50
  6. Step 6: Final answer
    x = 778.42

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.