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Finding the Fourth Proportional to 275, 379.55 and 158.54

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Solution

The fourth proportional to 275, 379.55 and 158.54 is: 218.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    275 : 379.55 = 158.54 : x
  2. Step 2: Convert to fraction form
    275/379.55 = 158.54/x
  3. Step 3: Cross multiply
    275x = 379.55 × 158.54
  4. Step 4: Simplify right side
    275x = 60,173.86
  5. Step 5: Solve for x
    x = 60,173.86/275
  6. Step 6: Final answer
    x = 218.81

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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.