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Finding the Fourth Proportional to 3,979.86, 5,492.02 and 2,211.46

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Solution

The fourth proportional to 3,979.86, 5,492.02 and 2,211.46 is: 3,051.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.86 : 5,492.02 = 2,211.46 : x
  2. Step 2: Convert to fraction form
    3,979.86/5,492.02 = 2,211.46/x
  3. Step 3: Cross multiply
    3,979.86x = 5,492.02 × 2,211.46
  4. Step 4: Simplify right side
    3,979.86x = 12,145,382.55
  5. Step 5: Solve for x
    x = 12,145,382.55/3,979.86
  6. Step 6: Final answer
    x = 3,051.71

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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.