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Finding the Fourth Proportional to 255.82, 383.46 and 111.55

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Solution

The fourth proportional to 255.82, 383.46 and 111.55 is: 167.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.82 : 383.46 = 111.55 : x
  2. Step 2: Convert to fraction form
    255.82/383.46 = 111.55/x
  3. Step 3: Cross multiply
    255.82x = 383.46 × 111.55
  4. Step 4: Simplify right side
    255.82x = 42,774.96
  5. Step 5: Solve for x
    x = 42,774.96/255.82
  6. Step 6: Final answer
    x = 167.21

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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.