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Finding the Fourth Proportional to 449.54, 620.39 and 318.59

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Solution

The fourth proportional to 449.54, 620.39 and 318.59 is: 439.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.54 : 620.39 = 318.59 : x
  2. Step 2: Convert to fraction form
    449.54/620.39 = 318.59/x
  3. Step 3: Cross multiply
    449.54x = 620.39 × 318.59
  4. Step 4: Simplify right side
    449.54x = 197,650.05
  5. Step 5: Solve for x
    x = 197,650.05/449.54
  6. Step 6: Final answer
    x = 439.67

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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.