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Finding the Fourth Proportional to 166.16, 249.21 and 83.81

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Solution

The fourth proportional to 166.16, 249.21 and 83.81 is: 125.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.16 : 249.21 = 83.81 : x
  2. Step 2: Convert to fraction form
    166.16/249.21 = 83.81/x
  3. Step 3: Cross multiply
    166.16x = 249.21 × 83.81
  4. Step 4: Simplify right side
    166.16x = 20,886.91
  5. Step 5: Solve for x
    x = 20,886.91/166.16
  6. Step 6: Final answer
    x = 125.70

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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.