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Finding the Fourth Proportional to 451.45, 622.23 and 318.72

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Solution

The fourth proportional to 451.45, 622.23 and 318.72 is: 439.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.45 : 622.23 = 318.72 : x
  2. Step 2: Convert to fraction form
    451.45/622.23 = 318.72/x
  3. Step 3: Cross multiply
    451.45x = 622.23 × 318.72
  4. Step 4: Simplify right side
    451.45x = 198,317.15
  5. Step 5: Solve for x
    x = 198,317.15/451.45
  6. Step 6: Final answer
    x = 439.29

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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.