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Finding the Fourth Proportional to 222.35, 306.80 and 129.09

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Solution

The fourth proportional to 222.35, 306.80 and 129.09 is: 178.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.35 : 306.80 = 129.09 : x
  2. Step 2: Convert to fraction form
    222.35/306.80 = 129.09/x
  3. Step 3: Cross multiply
    222.35x = 306.80 × 129.09
  4. Step 4: Simplify right side
    222.35x = 39,606.53
  5. Step 5: Solve for x
    x = 39,606.53/222.35
  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.