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Finding the Fourth Proportional to 221.10, 329.06 and 212.90

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Solution

The fourth proportional to 221.10, 329.06 and 212.90 is: 316.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.10 : 329.06 = 212.90 : x
  2. Step 2: Convert to fraction form
    221.10/329.06 = 212.90/x
  3. Step 3: Cross multiply
    221.10x = 329.06 × 212.90
  4. Step 4: Simplify right side
    221.10x = 70,054.16
  5. Step 5: Solve for x
    x = 70,054.16/221.10
  6. Step 6: Final answer
    x = 316.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.