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Finding the Fourth Proportional to 489.86, 676.21 and 303.29

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Solution

The fourth proportional to 489.86, 676.21 and 303.29 is: 418.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.86 : 676.21 = 303.29 : x
  2. Step 2: Convert to fraction form
    489.86/676.21 = 303.29/x
  3. Step 3: Cross multiply
    489.86x = 676.21 × 303.29
  4. Step 4: Simplify right side
    489.86x = 205,087.73
  5. Step 5: Solve for x
    x = 205,087.73/489.86
  6. Step 6: Final answer
    x = 418.67

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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.