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Finding the Fourth Proportional to 3,809.88, 5,715.90 and 1,213.02

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Solution

The fourth proportional to 3,809.88, 5,715.90 and 1,213.02 is: 1,819.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,809.88 : 5,715.90 = 1,213.02 : x
  2. Step 2: Convert to fraction form
    3,809.88/5,715.90 = 1,213.02/x
  3. Step 3: Cross multiply
    3,809.88x = 5,715.90 × 1,213.02
  4. Step 4: Simplify right side
    3,809.88x = 6,933,501.02
  5. Step 5: Solve for x
    x = 6,933,501.02/3,809.88
  6. Step 6: Final answer
    x = 1,819.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.