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Finding the Fourth Proportional to 222.16, 306.50 and 128.89

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Solution

The fourth proportional to 222.16, 306.50 and 128.89 is: 177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.16 : 306.50 = 128.89 : x
  2. Step 2: Convert to fraction form
    222.16/306.50 = 128.89/x
  3. Step 3: Cross multiply
    222.16x = 306.50 × 128.89
  4. Step 4: Simplify right side
    222.16x = 39,503.37
  5. Step 5: Solve for x
    x = 39,503.37/222.16
  6. Step 6: Final answer
    x = 177.82

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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.