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Finding the Fourth Proportional to 481.90, 665.04 and 285.43

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Solution

The fourth proportional to 481.90, 665.04 and 285.43 is: 393.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.90 : 665.04 = 285.43 : x
  2. Step 2: Convert to fraction form
    481.90/665.04 = 285.43/x
  3. Step 3: Cross multiply
    481.90x = 665.04 × 285.43
  4. Step 4: Simplify right side
    481.90x = 189,822.37
  5. Step 5: Solve for x
    x = 189,822.37/481.90
  6. Step 6: Final answer
    x = 393.90

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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.