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Finding the Fourth Proportional to 989.34, 1,481.58 and 680.73

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Solution

The fourth proportional to 989.34, 1,481.58 and 680.73 is: 1,019.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.34 : 1,481.58 = 680.73 : x
  2. Step 2: Convert to fraction form
    989.34/1,481.58 = 680.73/x
  3. Step 3: Cross multiply
    989.34x = 1,481.58 × 680.73
  4. Step 4: Simplify right side
    989.34x = 1,008,555.95
  5. Step 5: Solve for x
    x = 1,008,555.95/989.34
  6. Step 6: Final answer
    x = 1,019.42

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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.