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Finding the Fourth Proportional to 134.81, 201.96 and 128.66

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Solution

The fourth proportional to 134.81, 201.96 and 128.66 is: 192.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.81 : 201.96 = 128.66 : x
  2. Step 2: Convert to fraction form
    134.81/201.96 = 128.66/x
  3. Step 3: Cross multiply
    134.81x = 201.96 × 128.66
  4. Step 4: Simplify right side
    134.81x = 25,983.05
  5. Step 5: Solve for x
    x = 25,983.05/134.81
  6. Step 6: Final answer
    x = 192.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.