Home / 3,109.34-4,291.43-1,990.23

Finding the Fourth Proportional to 3,109.34, 4,291.43 and 1,990.23

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Solution

The fourth proportional to 3,109.34, 4,291.43 and 1,990.23 is: 2,746.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.34 : 4,291.43 = 1,990.23 : x
  2. Step 2: Convert to fraction form
    3,109.34/4,291.43 = 1,990.23/x
  3. Step 3: Cross multiply
    3,109.34x = 4,291.43 × 1,990.23
  4. Step 4: Simplify right side
    3,109.34x = 8,540,932.73
  5. Step 5: Solve for x
    x = 8,540,932.73/3,109.34
  6. Step 6: Final answer
    x = 2,746.86

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Double scale
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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.