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Finding the Fourth Proportional to 419.78, 628.38 and 282.44

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Solution

The fourth proportional to 419.78, 628.38 and 282.44 is: 422.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.78 : 628.38 = 282.44 : x
  2. Step 2: Convert to fraction form
    419.78/628.38 = 282.44/x
  3. Step 3: Cross multiply
    419.78x = 628.38 × 282.44
  4. Step 4: Simplify right side
    419.78x = 177,479.65
  5. Step 5: Solve for x
    x = 177,479.65/419.78
  6. Step 6: Final answer
    x = 422.79

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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.