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Finding the Fourth Proportional to 111.63, 154.75 and 105.78

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Solution

The fourth proportional to 111.63, 154.75 and 105.78 is: 146.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.63 : 154.75 = 105.78 : x
  2. Step 2: Convert to fraction form
    111.63/154.75 = 105.78/x
  3. Step 3: Cross multiply
    111.63x = 154.75 × 105.78
  4. Step 4: Simplify right side
    111.63x = 16,369.46
  5. Step 5: Solve for x
    x = 16,369.46/111.63
  6. Step 6: Final answer
    x = 146.64

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.