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Finding the Fourth Proportional to 481.64, 664.35 and 285

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Solution

The fourth proportional to 481.64, 664.35 and 285 is: 393.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.64 : 664.35 = 285 : x
  2. Step 2: Convert to fraction form
    481.64/664.35 = 285/x
  3. Step 3: Cross multiply
    481.64x = 664.35 × 285
  4. Step 4: Simplify right side
    481.64x = 189,339.75
  5. Step 5: Solve for x
    x = 189,339.75/481.64
  6. Step 6: Final answer
    x = 393.12

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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.