Home / 3,990.50-5,976.62-1,911.95

Finding the Fourth Proportional to 3,990.50, 5,976.62 and 1,911.95

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Solution

The fourth proportional to 3,990.50, 5,976.62 and 1,911.95 is: 2,863.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.50 : 5,976.62 = 1,911.95 : x
  2. Step 2: Convert to fraction form
    3,990.50/5,976.62 = 1,911.95/x
  3. Step 3: Cross multiply
    3,990.50x = 5,976.62 × 1,911.95
  4. Step 4: Simplify right side
    3,990.50x = 11,426,998.61
  5. Step 5: Solve for x
    x = 11,426,998.61/3,990.50
  6. Step 6: Final answer
    x = 2,863.55

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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.