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Finding the Fourth Proportional to 396.70, 547.47 and 222.07

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Solution

The fourth proportional to 396.70, 547.47 and 222.07 is: 306.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.70 : 547.47 = 222.07 : x
  2. Step 2: Convert to fraction form
    396.70/547.47 = 222.07/x
  3. Step 3: Cross multiply
    396.70x = 547.47 × 222.07
  4. Step 4: Simplify right side
    396.70x = 121,573.93
  5. Step 5: Solve for x
    x = 121,573.93/396.70
  6. Step 6: Final answer
    x = 306.47

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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.