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Finding the Fourth Proportional to 166.44, 249.18 and 128.07

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Solution

The fourth proportional to 166.44, 249.18 and 128.07 is: 191.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.44 : 249.18 = 128.07 : x
  2. Step 2: Convert to fraction form
    166.44/249.18 = 128.07/x
  3. Step 3: Cross multiply
    166.44x = 249.18 × 128.07
  4. Step 4: Simplify right side
    166.44x = 31,912.48
  5. Step 5: Solve for x
    x = 31,912.48/166.44
  6. Step 6: Final answer
    x = 191.74

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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.