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Finding the Fourth Proportional to 222.30, 305.82 and 212.22

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Solution

The fourth proportional to 222.30, 305.82 and 212.22 is: 291.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.30 : 305.82 = 212.22 : x
  2. Step 2: Convert to fraction form
    222.30/305.82 = 212.22/x
  3. Step 3: Cross multiply
    222.30x = 305.82 × 212.22
  4. Step 4: Simplify right side
    222.30x = 64,901.12
  5. Step 5: Solve for x
    x = 64,901.12/222.30
  6. Step 6: Final answer
    x = 291.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.