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Finding the Fourth Proportional to 3,909.87, 5,861.16 and 1,959.80

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Solution

The fourth proportional to 3,909.87, 5,861.16 and 1,959.80 is: 2,937.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.87 : 5,861.16 = 1,959.80 : x
  2. Step 2: Convert to fraction form
    3,909.87/5,861.16 = 1,959.80/x
  3. Step 3: Cross multiply
    3,909.87x = 5,861.16 × 1,959.80
  4. Step 4: Simplify right side
    3,909.87x = 11,486,672.06
  5. Step 5: Solve for x
    x = 11,486,672.06/3,909.87
  6. Step 6: Final answer
    x = 2,937.87

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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.