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Finding the Fourth Proportional to 133.21, 183.82 and 74.21

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Solution

The fourth proportional to 133.21, 183.82 and 74.21 is: 102.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.21 : 183.82 = 74.21 : x
  2. Step 2: Convert to fraction form
    133.21/183.82 = 74.21/x
  3. Step 3: Cross multiply
    133.21x = 183.82 × 74.21
  4. Step 4: Simplify right side
    133.21x = 13,640.86
  5. Step 5: Solve for x
    x = 13,640.86/133.21
  6. Step 6: Final answer
    x = 102.40

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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.