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Finding the Fourth Proportional to 133.68, 199.38 and 128.88

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Solution

The fourth proportional to 133.68, 199.38 and 128.88 is: 192.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.68 : 199.38 = 128.88 : x
  2. Step 2: Convert to fraction form
    133.68/199.38 = 128.88/x
  3. Step 3: Cross multiply
    133.68x = 199.38 × 128.88
  4. Step 4: Simplify right side
    133.68x = 25,696.09
  5. Step 5: Solve for x
    x = 25,696.09/133.68
  6. Step 6: Final answer
    x = 192.22

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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.