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Finding the Fourth Proportional to 185.43, 255.96 and 111.72

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Solution

The fourth proportional to 185.43, 255.96 and 111.72 is: 154.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.43 : 255.96 = 111.72 : x
  2. Step 2: Convert to fraction form
    185.43/255.96 = 111.72/x
  3. Step 3: Cross multiply
    185.43x = 255.96 × 111.72
  4. Step 4: Simplify right side
    185.43x = 28,595.85
  5. Step 5: Solve for x
    x = 28,595.85/185.43
  6. Step 6: Final answer
    x = 154.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.