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Finding the Fourth Proportional to 451.44, 622.79 and 318.86

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Solution

The fourth proportional to 451.44, 622.79 and 318.86 is: 439.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.44 : 622.79 = 318.86 : x
  2. Step 2: Convert to fraction form
    451.44/622.79 = 318.86/x
  3. Step 3: Cross multiply
    451.44x = 622.79 × 318.86
  4. Step 4: Simplify right side
    451.44x = 198,578.11
  5. Step 5: Solve for x
    x = 198,578.11/451.44
  6. Step 6: Final answer
    x = 439.88

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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.