Home / 1,990.94-2,981.77-1,921.73

Finding the Fourth Proportional to 1,990.94, 2,981.77 and 1,921.73

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Solution

The fourth proportional to 1,990.94, 2,981.77 and 1,921.73 is: 2,878.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.94 : 2,981.77 = 1,921.73 : x
  2. Step 2: Convert to fraction form
    1,990.94/2,981.77 = 1,921.73/x
  3. Step 3: Cross multiply
    1,990.94x = 2,981.77 × 1,921.73
  4. Step 4: Simplify right side
    1,990.94x = 5,730,137.15
  5. Step 5: Solve for x
    x = 5,730,137.15/1,990.94
  6. Step 6: Final answer
    x = 2,878.11

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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.