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Finding the Fourth Proportional to 273.78, 411.21 and 165.78

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Solution

The fourth proportional to 273.78, 411.21 and 165.78 is: 249.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.78 : 411.21 = 165.78 : x
  2. Step 2: Convert to fraction form
    273.78/411.21 = 165.78/x
  3. Step 3: Cross multiply
    273.78x = 411.21 × 165.78
  4. Step 4: Simplify right side
    273.78x = 68,170.39
  5. Step 5: Solve for x
    x = 68,170.39/273.78
  6. Step 6: Final answer
    x = 249.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.