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Finding the Fourth Proportional to 297.61, 446.43 and 81.19

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Solution

The fourth proportional to 297.61, 446.43 and 81.19 is: 121.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.61 : 446.43 = 81.19 : x
  2. Step 2: Convert to fraction form
    297.61/446.43 = 81.19/x
  3. Step 3: Cross multiply
    297.61x = 446.43 × 81.19
  4. Step 4: Simplify right side
    297.61x = 36,245.65
  5. Step 5: Solve for x
    x = 36,245.65/297.61
  6. Step 6: Final answer
    x = 121.79

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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.