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Finding the Fourth Proportional to 128.34, 193.55 and 126.54

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Solution

The fourth proportional to 128.34, 193.55 and 126.54 is: 190.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.34 : 193.55 = 126.54 : x
  2. Step 2: Convert to fraction form
    128.34/193.55 = 126.54/x
  3. Step 3: Cross multiply
    128.34x = 193.55 × 126.54
  4. Step 4: Simplify right side
    128.34x = 24,491.18
  5. Step 5: Solve for x
    x = 24,491.18/128.34
  6. Step 6: Final answer
    x = 190.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.