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Finding the Fourth Proportional to 222.13, 306.45 and 143.42

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Solution

The fourth proportional to 222.13, 306.45 and 143.42 is: 197.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.13 : 306.45 = 143.42 : x
  2. Step 2: Convert to fraction form
    222.13/306.45 = 143.42/x
  3. Step 3: Cross multiply
    222.13x = 306.45 × 143.42
  4. Step 4: Simplify right side
    222.13x = 43,951.06
  5. Step 5: Solve for x
    x = 43,951.06/222.13
  6. Step 6: Final answer
    x = 197.86

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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.