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Finding the Fourth Proportional to 273.21, 409.46 and 212.05

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Solution

The fourth proportional to 273.21, 409.46 and 212.05 is: 317.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.21 : 409.46 = 212.05 : x
  2. Step 2: Convert to fraction form
    273.21/409.46 = 212.05/x
  3. Step 3: Cross multiply
    273.21x = 409.46 × 212.05
  4. Step 4: Simplify right side
    273.21x = 86,825.44
  5. Step 5: Solve for x
    x = 86,825.44/273.21
  6. Step 6: Final answer
    x = 317.80

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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.