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Finding the Fourth Proportional to 489.15, 674.73 and 378.27

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Solution

The fourth proportional to 489.15, 674.73 and 378.27 is: 521.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.15 : 674.73 = 378.27 : x
  2. Step 2: Convert to fraction form
    489.15/674.73 = 378.27/x
  3. Step 3: Cross multiply
    489.15x = 674.73 × 378.27
  4. Step 4: Simplify right side
    489.15x = 255,230.12
  5. Step 5: Solve for x
    x = 255,230.12/489.15
  6. Step 6: Final answer
    x = 521.78

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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.