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Finding the Fourth Proportional to 481.89, 665.15 and 285.54

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Solution

The fourth proportional to 481.89, 665.15 and 285.54 is: 394.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.89 : 665.15 = 285.54 : x
  2. Step 2: Convert to fraction form
    481.89/665.15 = 285.54/x
  3. Step 3: Cross multiply
    481.89x = 665.15 × 285.54
  4. Step 4: Simplify right side
    481.89x = 189,925.50
  5. Step 5: Solve for x
    x = 189,925.50/481.89
  6. Step 6: Final answer
    x = 394.13

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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.