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Finding the Fourth Proportional to 166.28, 249.20 and 105.30

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Solution

The fourth proportional to 166.28, 249.20 and 105.30 is: 157.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.28 : 249.20 = 105.30 : x
  2. Step 2: Convert to fraction form
    166.28/249.20 = 105.30/x
  3. Step 3: Cross multiply
    166.28x = 249.20 × 105.30
  4. Step 4: Simplify right side
    166.28x = 26,240.76
  5. Step 5: Solve for x
    x = 26,240.76/166.28
  6. Step 6: Final answer
    x = 157.81

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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.