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Finding the Fourth Proportional to 222.37, 306.78 and 129.12

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Solution

The fourth proportional to 222.37, 306.78 and 129.12 is: 178.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.37 : 306.78 = 129.12 : x
  2. Step 2: Convert to fraction form
    222.37/306.78 = 129.12/x
  3. Step 3: Cross multiply
    222.37x = 306.78 × 129.12
  4. Step 4: Simplify right side
    222.37x = 39,611.43
  5. Step 5: Solve for x
    x = 39,611.43/222.37
  6. Step 6: Final answer
    x = 178.13

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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.