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Finding the Fourth Proportional to 408.33, 611.76 and 279.45

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Solution

The fourth proportional to 408.33, 611.76 and 279.45 is: 418.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.33 : 611.76 = 279.45 : x
  2. Step 2: Convert to fraction form
    408.33/611.76 = 279.45/x
  3. Step 3: Cross multiply
    408.33x = 611.76 × 279.45
  4. Step 4: Simplify right side
    408.33x = 170,956.33
  5. Step 5: Solve for x
    x = 170,956.33/408.33
  6. Step 6: Final answer
    x = 418.67

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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.