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Finding the Third Proportional to 198.75 and 312

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Solution

The third proportional to 198.75 and 312 is: 489.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.75 : 312 = 312 : x
  2. Step 2: Convert to fraction form
    198.75/312 = 312/x
  3. Step 3: Cross multiply
    198.75x = 312 × 312
  4. Step 4: Simplify right side
    198.75x = 97,344
  5. Step 5: Solve for x
    x = 97,344/198.75
  6. Step 6: Final answer
    x = 489.78

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.