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Finding the Fourth Proportional to 134.05, 199.73 and 128.15

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Solution

The fourth proportional to 134.05, 199.73 and 128.15 is: 190.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.05 : 199.73 = 128.15 : x
  2. Step 2: Convert to fraction form
    134.05/199.73 = 128.15/x
  3. Step 3: Cross multiply
    134.05x = 199.73 × 128.15
  4. Step 4: Simplify right side
    134.05x = 25,594.99
  5. Step 5: Solve for x
    x = 25,594.99/134.05
  6. Step 6: Final answer
    x = 190.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.