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Finding the Fourth Proportional to 221.93, 306.26 and 128.67

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Solution

The fourth proportional to 221.93, 306.26 and 128.67 is: 177.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.93 : 306.26 = 128.67 : x
  2. Step 2: Convert to fraction form
    221.93/306.26 = 128.67/x
  3. Step 3: Cross multiply
    221.93x = 306.26 × 128.67
  4. Step 4: Simplify right side
    221.93x = 39,405.83
  5. Step 5: Solve for x
    x = 39,405.83/221.93
  6. Step 6: Final answer
    x = 177.56

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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.