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Finding the Fourth Proportional to 1,990.56, 3,008.40 and 1,968.68

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Solution

The fourth proportional to 1,990.56, 3,008.40 and 1,968.68 is: 2,975.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.56 : 3,008.40 = 1,968.68 : x
  2. Step 2: Convert to fraction form
    1,990.56/3,008.40 = 1,968.68/x
  3. Step 3: Cross multiply
    1,990.56x = 3,008.40 × 1,968.68
  4. Step 4: Simplify right side
    1,990.56x = 5,922,576.91
  5. Step 5: Solve for x
    x = 5,922,576.91/1,990.56
  6. Step 6: Final answer
    x = 2,975.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.