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Finding the Fourth Proportional to 132.90, 198.91 and 128.10

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Solution

The fourth proportional to 132.90, 198.91 and 128.10 is: 191.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.90 : 198.91 = 128.10 : x
  2. Step 2: Convert to fraction form
    132.90/198.91 = 128.10/x
  3. Step 3: Cross multiply
    132.90x = 198.91 × 128.10
  4. Step 4: Simplify right side
    132.90x = 25,480.37
  5. Step 5: Solve for x
    x = 25,480.37/132.90
  6. Step 6: Final answer
    x = 191.73

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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.