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Finding the Fourth Proportional to 111.21, 165.98 and 108.47

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Solution

The fourth proportional to 111.21, 165.98 and 108.47 is: 161.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.21 : 165.98 = 108.47 : x
  2. Step 2: Convert to fraction form
    111.21/165.98 = 108.47/x
  3. Step 3: Cross multiply
    111.21x = 165.98 × 108.47
  4. Step 4: Simplify right side
    111.21x = 18,004.54
  5. Step 5: Solve for x
    x = 18,004.54/111.21
  6. Step 6: Final answer
    x = 161.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.