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Finding the Fourth Proportional to 481.46, 722.39 and 420.71

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Solution

The fourth proportional to 481.46, 722.39 and 420.71 is: 631.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.46 : 722.39 = 420.71 : x
  2. Step 2: Convert to fraction form
    481.46/722.39 = 420.71/x
  3. Step 3: Cross multiply
    481.46x = 722.39 × 420.71
  4. Step 4: Simplify right side
    481.46x = 303,910.98
  5. Step 5: Solve for x
    x = 303,910.98/481.46
  6. Step 6: Final answer
    x = 631.23

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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.