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Finding the Fourth Proportional to 3,181.70, 4,390.74 and 1,939.70

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Solution

The fourth proportional to 3,181.70, 4,390.74 and 1,939.70 is: 2,676.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,181.70 : 4,390.74 = 1,939.70 : x
  2. Step 2: Convert to fraction form
    3,181.70/4,390.74 = 1,939.70/x
  3. Step 3: Cross multiply
    3,181.70x = 4,390.74 × 1,939.70
  4. Step 4: Simplify right side
    3,181.70x = 8,516,722.08
  5. Step 5: Solve for x
    x = 8,516,722.08/3,181.70
  6. Step 6: Final answer
    x = 2,676.78

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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.