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Finding the Fourth Proportional to 3,979.66, 5,491.65 and 2,211.19

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Solution

The fourth proportional to 3,979.66, 5,491.65 and 2,211.19 is: 3,051.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.66 : 5,491.65 = 2,211.19 : x
  2. Step 2: Convert to fraction form
    3,979.66/5,491.65 = 2,211.19/x
  3. Step 3: Cross multiply
    3,979.66x = 5,491.65 × 2,211.19
  4. Step 4: Simplify right side
    3,979.66x = 12,143,081.56
  5. Step 5: Solve for x
    x = 12,143,081.56/3,979.66
  6. Step 6: Final answer
    x = 3,051.29

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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.