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Finding the Fourth Proportional to 1,990.97, 2,986.46 and 965.69

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Solution

The fourth proportional to 1,990.97, 2,986.46 and 965.69 is: 1,448.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.97 : 2,986.46 = 965.69 : x
  2. Step 2: Convert to fraction form
    1,990.97/2,986.46 = 965.69/x
  3. Step 3: Cross multiply
    1,990.97x = 2,986.46 × 965.69
  4. Step 4: Simplify right side
    1,990.97x = 2,883,989.73
  5. Step 5: Solve for x
    x = 2,883,989.73/1,990.97
  6. Step 6: Final answer
    x = 1,448.54

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Similar ratio
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1.5x scale

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.