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Finding the Fourth Proportional to 1,990.81, 2,986.56 and 758.33

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Solution

The fourth proportional to 1,990.81, 2,986.56 and 758.33 is: 1,137.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.81 : 2,986.56 = 758.33 : x
  2. Step 2: Convert to fraction form
    1,990.81/2,986.56 = 758.33/x
  3. Step 3: Cross multiply
    1,990.81x = 2,986.56 × 758.33
  4. Step 4: Simplify right side
    1,990.81x = 2,264,798.04
  5. Step 5: Solve for x
    x = 2,264,798.04/1,990.81
  6. Step 6: Final answer
    x = 1,137.63

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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.