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Finding the Third Proportional to 198 and 515.25

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Solution

The third proportional to 198 and 515.25 is: 1,340.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    198 : 515.25 = 515.25 : x
  2. Step 2: Convert to fraction form
    198/515.25 = 515.25/x
  3. Step 3: Cross multiply
    198x = 515.25 × 515.25
  4. Step 4: Simplify right side
    198x = 265,482.56
  5. Step 5: Solve for x
    x = 265,482.56/198
  6. Step 6: Final answer
    x = 1,340.82

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Why These Related Problems?

These problems maintain the same ratio (2.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.