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Finding the Fourth Proportional to 1,993.70, 2,989.32 and 759.79

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Solution

The fourth proportional to 1,993.70, 2,989.32 and 759.79 is: 1,139.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.70 : 2,989.32 = 759.79 : x
  2. Step 2: Convert to fraction form
    1,993.70/2,989.32 = 759.79/x
  3. Step 3: Cross multiply
    1,993.70x = 2,989.32 × 759.79
  4. Step 4: Simplify right side
    1,993.70x = 2,271,247.97
  5. Step 5: Solve for x
    x = 2,271,247.97/1,993.70
  6. Step 6: Final answer
    x = 1,139.22

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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.