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Finding the Fourth Proportional to 418.87, 628.49 and 187.75

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Solution

The fourth proportional to 418.87, 628.49 and 187.75 is: 281.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.87 : 628.49 = 187.75 : x
  2. Step 2: Convert to fraction form
    418.87/628.49 = 187.75/x
  3. Step 3: Cross multiply
    418.87x = 628.49 × 187.75
  4. Step 4: Simplify right side
    418.87x = 117,998.06
  5. Step 5: Solve for x
    x = 117,998.06/418.87
  6. Step 6: Final answer
    x = 281.71

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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.