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Finding the Fourth Proportional to 458.73, 687.38 and 276.21

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Solution

The fourth proportional to 458.73, 687.38 and 276.21 is: 413.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.73 : 687.38 = 276.21 : x
  2. Step 2: Convert to fraction form
    458.73/687.38 = 276.21/x
  3. Step 3: Cross multiply
    458.73x = 687.38 × 276.21
  4. Step 4: Simplify right side
    458.73x = 189,859.85
  5. Step 5: Solve for x
    x = 189,859.85/458.73
  6. Step 6: Final answer
    x = 413.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.