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Finding the Fourth Proportional to 222.31, 306.92 and 143.66

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Solution

The fourth proportional to 222.31, 306.92 and 143.66 is: 198.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.31 : 306.92 = 143.66 : x
  2. Step 2: Convert to fraction form
    222.31/306.92 = 143.66/x
  3. Step 3: Cross multiply
    222.31x = 306.92 × 143.66
  4. Step 4: Simplify right side
    222.31x = 44,092.13
  5. Step 5: Solve for x
    x = 44,092.13/222.31
  6. Step 6: Final answer
    x = 198.34

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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.