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Finding the Fourth Proportional to 481.74, 723.21 and 385.44

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Solution

The fourth proportional to 481.74, 723.21 and 385.44 is: 578.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.74 : 723.21 = 385.44 : x
  2. Step 2: Convert to fraction form
    481.74/723.21 = 385.44/x
  3. Step 3: Cross multiply
    481.74x = 723.21 × 385.44
  4. Step 4: Simplify right side
    481.74x = 278,754.06
  5. Step 5: Solve for x
    x = 278,754.06/481.74
  6. Step 6: Final answer
    x = 578.64

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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.