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Finding the Third Proportional to 198 and 358

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Solution

The third proportional to 198 and 358 is: 647.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    198 : 358 = 358 : x
  2. Step 2: Convert to fraction form
    198/358 = 358/x
  3. Step 3: Cross multiply
    198x = 358 × 358
  4. Step 4: Simplify right side
    198x = 128,164
  5. Step 5: Solve for x
    x = 128,164/198
  6. Step 6: Final answer
    x = 647.29

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These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.