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Finding the Fourth Proportional to 135.02, 201.19 and 128.47

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Solution

The fourth proportional to 135.02, 201.19 and 128.47 is: 191.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.02 : 201.19 = 128.47 : x
  2. Step 2: Convert to fraction form
    135.02/201.19 = 128.47/x
  3. Step 3: Cross multiply
    135.02x = 201.19 × 128.47
  4. Step 4: Simplify right side
    135.02x = 25,845.73
  5. Step 5: Solve for x
    x = 25,845.73/135.02
  6. Step 6: Final answer
    x = 191.43

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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.