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Finding the Fourth Proportional to 222.03, 306.33 and 128.75

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Solution

The fourth proportional to 222.03, 306.33 and 128.75 is: 177.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.03 : 306.33 = 128.75 : x
  2. Step 2: Convert to fraction form
    222.03/306.33 = 128.75/x
  3. Step 3: Cross multiply
    222.03x = 306.33 × 128.75
  4. Step 4: Simplify right side
    222.03x = 39,440.75
  5. Step 5: Solve for x
    x = 39,440.75/222.03
  6. Step 6: Final answer
    x = 177.64

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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.