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Finding the Fourth Proportional to 166.42, 229.72 and 122.68

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Solution

The fourth proportional to 166.42, 229.72 and 122.68 is: 169.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.42 : 229.72 = 122.68 : x
  2. Step 2: Convert to fraction form
    166.42/229.72 = 122.68/x
  3. Step 3: Cross multiply
    166.42x = 229.72 × 122.68
  4. Step 4: Simplify right side
    166.42x = 28,180.90
  5. Step 5: Solve for x
    x = 28,180.90/166.42
  6. Step 6: Final answer
    x = 169.34

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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.