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Finding the Fourth Proportional to 133.93, 199.88 and 128.64

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Solution

The fourth proportional to 133.93, 199.88 and 128.64 is: 191.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.93 : 199.88 = 128.64 : x
  2. Step 2: Convert to fraction form
    133.93/199.88 = 128.64/x
  3. Step 3: Cross multiply
    133.93x = 199.88 × 128.64
  4. Step 4: Simplify right side
    133.93x = 25,712.56
  5. Step 5: Solve for x
    x = 25,712.56/133.93
  6. Step 6: Final answer
    x = 191.99

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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.