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Finding the Fourth Proportional to 133.50, 200.42 and 128.03

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Solution

The fourth proportional to 133.50, 200.42 and 128.03 is: 192.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.50 : 200.42 = 128.03 : x
  2. Step 2: Convert to fraction form
    133.50/200.42 = 128.03/x
  3. Step 3: Cross multiply
    133.50x = 200.42 × 128.03
  4. Step 4: Simplify right side
    133.50x = 25,659.13
  5. Step 5: Solve for x
    x = 25,659.13/133.50
  6. Step 6: Final answer
    x = 192.20

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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.