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Finding the Fourth Proportional to 303.81, 455.72 and 121.21

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Solution

The fourth proportional to 303.81, 455.72 and 121.21 is: 181.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.81 : 455.72 = 121.21 : x
  2. Step 2: Convert to fraction form
    303.81/455.72 = 121.21/x
  3. Step 3: Cross multiply
    303.81x = 455.72 × 121.21
  4. Step 4: Simplify right side
    303.81x = 55,235.54
  5. Step 5: Solve for x
    x = 55,235.54/303.81
  6. Step 6: Final answer
    x = 181.81

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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.