Home / 3,111.60-4,293.88-1,990.96

Finding the Fourth Proportional to 3,111.60, 4,293.88 and 1,990.96

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Solution

The fourth proportional to 3,111.60, 4,293.88 and 1,990.96 is: 2,747.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.60 : 4,293.88 = 1,990.96 : x
  2. Step 2: Convert to fraction form
    3,111.60/4,293.88 = 1,990.96/x
  3. Step 3: Cross multiply
    3,111.60x = 4,293.88 × 1,990.96
  4. Step 4: Simplify right side
    3,111.60x = 8,548,943.32
  5. Step 5: Solve for x
    x = 8,548,943.32/3,111.60
  6. Step 6: Final answer
    x = 2,747.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.