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Finding the Fourth Proportional to 94.21, 141.21 and 80.46

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Solution

The fourth proportional to 94.21, 141.21 and 80.46 is: 120.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.21 : 141.21 = 80.46 : x
  2. Step 2: Convert to fraction form
    94.21/141.21 = 80.46/x
  3. Step 3: Cross multiply
    94.21x = 141.21 × 80.46
  4. Step 4: Simplify right side
    94.21x = 11,361.76
  5. Step 5: Solve for x
    x = 11,361.76/94.21
  6. Step 6: Final answer
    x = 120.60

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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.