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Finding the Fourth Proportional to 297.70, 446.49 and 81.22

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Solution

The fourth proportional to 297.70, 446.49 and 81.22 is: 121.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.70 : 446.49 = 81.22 : x
  2. Step 2: Convert to fraction form
    297.70/446.49 = 81.22/x
  3. Step 3: Cross multiply
    297.70x = 446.49 × 81.22
  4. Step 4: Simplify right side
    297.70x = 36,261.69
  5. Step 5: Solve for x
    x = 36,261.69/297.70
  6. Step 6: Final answer
    x = 121.81

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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.