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Finding the Third Proportional to 205.78 and 325.78

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Solution

The third proportional to 205.78 and 325.78 is: 515.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.78 : 325.78 = 325.78 : x
  2. Step 2: Convert to fraction form
    205.78/325.78 = 325.78/x
  3. Step 3: Cross multiply
    205.78x = 325.78 × 325.78
  4. Step 4: Simplify right side
    205.78x = 106,133.42
  5. Step 5: Solve for x
    x = 106,133.42/205.78
  6. Step 6: Final answer
    x = 515.76

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.