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Finding the Fourth Proportional to 135.32, 201.88 and 128.48

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Solution

The fourth proportional to 135.32, 201.88 and 128.48 is: 191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.32 : 201.88 = 128.48 : x
  2. Step 2: Convert to fraction form
    135.32/201.88 = 128.48/x
  3. Step 3: Cross multiply
    135.32x = 201.88 × 128.48
  4. Step 4: Simplify right side
    135.32x = 25,936.69
  5. Step 5: Solve for x
    x = 25,936.69/135.32
  6. Step 6: Final answer
    x = 191.68

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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.