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Finding the Fourth Proportional to 355.03, 489.96 and 261.73

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Solution

The fourth proportional to 355.03, 489.96 and 261.73 is: 361.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.03 : 489.96 = 261.73 : x
  2. Step 2: Convert to fraction form
    355.03/489.96 = 261.73/x
  3. Step 3: Cross multiply
    355.03x = 489.96 × 261.73
  4. Step 4: Simplify right side
    355.03x = 128,237.23
  5. Step 5: Solve for x
    x = 128,237.23/355.03
  6. Step 6: Final answer
    x = 361.20

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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.