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Finding the Third Proportional to 131,640.75 and 198,390

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Solution

The third proportional to 131,640.75 and 198,390 is: 298,984.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,640.75 : 198,390 = 198,390 : x
  2. Step 2: Convert to fraction form
    131,640.75/198,390 = 198,390/x
  3. Step 3: Cross multiply
    131,640.75x = 198,390 × 198,390
  4. Step 4: Simplify right side
    131,640.75x = 39,358,592,100
  5. Step 5: Solve for x
    x = 39,358,592,100/131,640.75
  6. Step 6: Final answer
    x = 298,984.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.