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Finding the Fourth Proportional to 255.56, 352.96 and 197.78

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Solution

The fourth proportional to 255.56, 352.96 and 197.78 is: 273.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.56 : 352.96 = 197.78 : x
  2. Step 2: Convert to fraction form
    255.56/352.96 = 197.78/x
  3. Step 3: Cross multiply
    255.56x = 352.96 × 197.78
  4. Step 4: Simplify right side
    255.56x = 69,806.17
  5. Step 5: Solve for x
    x = 69,806.17/255.56
  6. Step 6: Final answer
    x = 273.16

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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.