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Finding the Fourth Proportional to 133.38, 183.74 and 102.20

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Solution

The fourth proportional to 133.38, 183.74 and 102.20 is: 140.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.38 : 183.74 = 102.20 : x
  2. Step 2: Convert to fraction form
    133.38/183.74 = 102.20/x
  3. Step 3: Cross multiply
    133.38x = 183.74 × 102.20
  4. Step 4: Simplify right side
    133.38x = 18,776.80
  5. Step 5: Solve for x
    x = 18,776.80/133.38
  6. Step 6: Final answer
    x = 140.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.