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Finding the Fourth Proportional to 220.95, 333.41 and 212.91

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Solution

The fourth proportional to 220.95, 333.41 and 212.91 is: 321.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.95 : 333.41 = 212.91 : x
  2. Step 2: Convert to fraction form
    220.95/333.41 = 212.91/x
  3. Step 3: Cross multiply
    220.95x = 333.41 × 212.91
  4. Step 4: Simplify right side
    220.95x = 70,986.86
  5. Step 5: Solve for x
    x = 70,986.86/220.95
  6. Step 6: Final answer
    x = 321.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.