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Finding the Fourth Proportional to 1,993.52, 2,990.64 and 659.39

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Solution

The fourth proportional to 1,993.52, 2,990.64 and 659.39 is: 989.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.52 : 2,990.64 = 659.39 : x
  2. Step 2: Convert to fraction form
    1,993.52/2,990.64 = 659.39/x
  3. Step 3: Cross multiply
    1,993.52x = 2,990.64 × 659.39
  4. Step 4: Simplify right side
    1,993.52x = 1,971,990.33
  5. Step 5: Solve for x
    x = 1,971,990.33/1,993.52
  6. Step 6: Final answer
    x = 989.20

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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.