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Finding the Fourth Proportional to 355.22, 489.60 and 285.14

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Solution

The fourth proportional to 355.22, 489.60 and 285.14 is: 393.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.22 : 489.60 = 285.14 : x
  2. Step 2: Convert to fraction form
    355.22/489.60 = 285.14/x
  3. Step 3: Cross multiply
    355.22x = 489.60 × 285.14
  4. Step 4: Simplify right side
    355.22x = 139,604.54
  5. Step 5: Solve for x
    x = 139,604.54/355.22
  6. Step 6: Final answer
    x = 393.01

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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.