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Finding the Fourth Proportional to 166.23, 249.57 and 129.78

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Solution

The fourth proportional to 166.23, 249.57 and 129.78 is: 194.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.23 : 249.57 = 129.78 : x
  2. Step 2: Convert to fraction form
    166.23/249.57 = 129.78/x
  3. Step 3: Cross multiply
    166.23x = 249.57 × 129.78
  4. Step 4: Simplify right side
    166.23x = 32,389.19
  5. Step 5: Solve for x
    x = 32,389.19/166.23
  6. Step 6: Final answer
    x = 194.85

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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.