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Finding the Third Proportional to 202.78 and 315

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Solution

The third proportional to 202.78 and 315 is: 489.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.78 : 315 = 315 : x
  2. Step 2: Convert to fraction form
    202.78/315 = 315/x
  3. Step 3: Cross multiply
    202.78x = 315 × 315
  4. Step 4: Simplify right side
    202.78x = 99,225
  5. Step 5: Solve for x
    x = 99,225/202.78
  6. Step 6: Final answer
    x = 489.32

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.