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Finding the Fourth Proportional to 481.76, 722.31 and 318.95

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Solution

The fourth proportional to 481.76, 722.31 and 318.95 is: 478.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.76 : 722.31 = 318.95 : x
  2. Step 2: Convert to fraction form
    481.76/722.31 = 318.95/x
  3. Step 3: Cross multiply
    481.76x = 722.31 × 318.95
  4. Step 4: Simplify right side
    481.76x = 230,380.77
  5. Step 5: Solve for x
    x = 230,380.77/481.76
  6. Step 6: Final answer
    x = 478.21

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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.