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Finding the Fourth Proportional to 197.38, 295.48 and 128.78

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Solution

The fourth proportional to 197.38, 295.48 and 128.78 is: 192.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.38 : 295.48 = 128.78 : x
  2. Step 2: Convert to fraction form
    197.38/295.48 = 128.78/x
  3. Step 3: Cross multiply
    197.38x = 295.48 × 128.78
  4. Step 4: Simplify right side
    197.38x = 38,051.91
  5. Step 5: Solve for x
    x = 38,051.91/197.38
  6. Step 6: Final answer
    x = 192.79

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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.