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Finding the Fourth Proportional to 133.12, 200 and 128.24

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Solution

The fourth proportional to 133.12, 200 and 128.24 is: 192.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.12 : 200 = 128.24 : x
  2. Step 2: Convert to fraction form
    133.12/200 = 128.24/x
  3. Step 3: Cross multiply
    133.12x = 200 × 128.24
  4. Step 4: Simplify right side
    133.12x = 25,648
  5. Step 5: Solve for x
    x = 25,648/133.12
  6. Step 6: Final answer
    x = 192.67

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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.