Home / 3,108.80-4,291.56-1,990.16

Finding the Fourth Proportional to 3,108.80, 4,291.56 and 1,990.16

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Solution

The fourth proportional to 3,108.80, 4,291.56 and 1,990.16 is: 2,747.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,108.80 : 4,291.56 = 1,990.16 : x
  2. Step 2: Convert to fraction form
    3,108.80/4,291.56 = 1,990.16/x
  3. Step 3: Cross multiply
    3,108.80x = 4,291.56 × 1,990.16
  4. Step 4: Simplify right side
    3,108.80x = 8,540,891.05
  5. Step 5: Solve for x
    x = 8,540,891.05/3,108.80
  6. Step 6: Final answer
    x = 2,747.33

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Half scale
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Double scale
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Similar ratio
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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.