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Finding the Fourth Proportional to 222.20, 331.45 and 211.40

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Solution

The fourth proportional to 222.20, 331.45 and 211.40 is: 315.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.20 : 331.45 = 211.40 : x
  2. Step 2: Convert to fraction form
    222.20/331.45 = 211.40/x
  3. Step 3: Cross multiply
    222.20x = 331.45 × 211.40
  4. Step 4: Simplify right side
    222.20x = 70,068.53
  5. Step 5: Solve for x
    x = 70,068.53/222.20
  6. Step 6: Final answer
    x = 315.34

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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.