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Finding the Fourth Proportional to 481.74, 664.60 and 285.18

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Solution

The fourth proportional to 481.74, 664.60 and 285.18 is: 393.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.74 : 664.60 = 285.18 : x
  2. Step 2: Convert to fraction form
    481.74/664.60 = 285.18/x
  3. Step 3: Cross multiply
    481.74x = 664.60 × 285.18
  4. Step 4: Simplify right side
    481.74x = 189,530.63
  5. Step 5: Solve for x
    x = 189,530.63/481.74
  6. Step 6: Final answer
    x = 393.43

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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.