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Finding the Fourth Proportional to 1,989.62, 2,984.49 and 949.73

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Solution

The fourth proportional to 1,989.62, 2,984.49 and 949.73 is: 1,424.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.62 : 2,984.49 = 949.73 : x
  2. Step 2: Convert to fraction form
    1,989.62/2,984.49 = 949.73/x
  3. Step 3: Cross multiply
    1,989.62x = 2,984.49 × 949.73
  4. Step 4: Simplify right side
    1,989.62x = 2,834,454.94
  5. Step 5: Solve for x
    x = 2,834,454.94/1,989.62
  6. Step 6: Final answer
    x = 1,424.62

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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.