Home / 3,181.86-4,392.45-2,121.39

Finding the Fourth Proportional to 3,181.86, 4,392.45 and 2,121.39

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Solution

The fourth proportional to 3,181.86, 4,392.45 and 2,121.39 is: 2,928.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,181.86 : 4,392.45 = 2,121.39 : x
  2. Step 2: Convert to fraction form
    3,181.86/4,392.45 = 2,121.39/x
  3. Step 3: Cross multiply
    3,181.86x = 4,392.45 × 2,121.39
  4. Step 4: Simplify right side
    3,181.86x = 9,318,105.47
  5. Step 5: Solve for x
    x = 9,318,105.47/3,181.86
  6. Step 6: Final answer
    x = 2,928.51

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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.