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Finding the Fourth Proportional to 218.74, 327.81 and 121.24

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Solution

The fourth proportional to 218.74, 327.81 and 121.24 is: 181.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.74 : 327.81 = 121.24 : x
  2. Step 2: Convert to fraction form
    218.74/327.81 = 121.24/x
  3. Step 3: Cross multiply
    218.74x = 327.81 × 121.24
  4. Step 4: Simplify right side
    218.74x = 39,742.70
  5. Step 5: Solve for x
    x = 39,742.70/218.74
  6. Step 6: Final answer
    x = 181.69

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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.