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Finding the Fourth Proportional to 303.75, 418.68 and 280.44

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Solution

The fourth proportional to 303.75, 418.68 and 280.44 is: 386.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.75 : 418.68 = 280.44 : x
  2. Step 2: Convert to fraction form
    303.75/418.68 = 280.44/x
  3. Step 3: Cross multiply
    303.75x = 418.68 × 280.44
  4. Step 4: Simplify right side
    303.75x = 117,414.62
  5. Step 5: Solve for x
    x = 117,414.62/303.75
  6. Step 6: Final answer
    x = 386.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.