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Finding the Fourth Proportional to 221.22, 331.71 and 128.67

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Solution

The fourth proportional to 221.22, 331.71 and 128.67 is: 192.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.22 : 331.71 = 128.67 : x
  2. Step 2: Convert to fraction form
    221.22/331.71 = 128.67/x
  3. Step 3: Cross multiply
    221.22x = 331.71 × 128.67
  4. Step 4: Simplify right side
    221.22x = 42,681.13
  5. Step 5: Solve for x
    x = 42,681.13/221.22
  6. Step 6: Final answer
    x = 192.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.