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Finding the Fourth Proportional to 155.09, 231.69 and 111.41

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Solution

The fourth proportional to 155.09, 231.69 and 111.41 is: 166.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.09 : 231.69 = 111.41 : x
  2. Step 2: Convert to fraction form
    155.09/231.69 = 111.41/x
  3. Step 3: Cross multiply
    155.09x = 231.69 × 111.41
  4. Step 4: Simplify right side
    155.09x = 25,812.58
  5. Step 5: Solve for x
    x = 25,812.58/155.09
  6. Step 6: Final answer
    x = 166.44

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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.