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Finding the Fourth Proportional to 222.26, 306.71 and 129

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Solution

The fourth proportional to 222.26, 306.71 and 129 is: 178.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.26 : 306.71 = 129 : x
  2. Step 2: Convert to fraction form
    222.26/306.71 = 129/x
  3. Step 3: Cross multiply
    222.26x = 306.71 × 129
  4. Step 4: Simplify right side
    222.26x = 39,564.95
  5. Step 5: Solve for x
    x = 39,564.95/222.26
  6. Step 6: Final answer
    x = 178.02

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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.