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Finding the Fourth Proportional to 221.79, 333.05 and 212.05

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Solution

The fourth proportional to 221.79, 333.05 and 212.05 is: 318.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.79 : 333.05 = 212.05 : x
  2. Step 2: Convert to fraction form
    221.79/333.05 = 212.05/x
  3. Step 3: Cross multiply
    221.79x = 333.05 × 212.05
  4. Step 4: Simplify right side
    221.79x = 70,623.25
  5. Step 5: Solve for x
    x = 70,623.25/221.79
  6. Step 6: Final answer
    x = 318.42

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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.