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Finding the Fourth Proportional to 111.04, 166.20 and 108.40

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Solution

The fourth proportional to 111.04, 166.20 and 108.40 is: 162.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.04 : 166.20 = 108.40 : x
  2. Step 2: Convert to fraction form
    111.04/166.20 = 108.40/x
  3. Step 3: Cross multiply
    111.04x = 166.20 × 108.40
  4. Step 4: Simplify right side
    111.04x = 18,016.08
  5. Step 5: Solve for x
    x = 18,016.08/111.04
  6. Step 6: Final answer
    x = 162.25

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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.