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Finding the Fourth Proportional to 222.80, 331.90 and 212.36

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Solution

The fourth proportional to 222.80, 331.90 and 212.36 is: 316.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.80 : 331.90 = 212.36 : x
  2. Step 2: Convert to fraction form
    222.80/331.90 = 212.36/x
  3. Step 3: Cross multiply
    222.80x = 331.90 × 212.36
  4. Step 4: Simplify right side
    222.80x = 70,482.28
  5. Step 5: Solve for x
    x = 70,482.28/222.80
  6. Step 6: Final answer
    x = 316.35

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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.