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Finding the Fourth Proportional to 418.99, 628.89 and 281.56

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Solution

The fourth proportional to 418.99, 628.89 and 281.56 is: 422.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.99 : 628.89 = 281.56 : x
  2. Step 2: Convert to fraction form
    418.99/628.89 = 281.56/x
  3. Step 3: Cross multiply
    418.99x = 628.89 × 281.56
  4. Step 4: Simplify right side
    418.99x = 177,070.27
  5. Step 5: Solve for x
    x = 177,070.27/418.99
  6. Step 6: Final answer
    x = 422.61

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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.