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Finding the Fourth Proportional to 8,919.85, 12,309.41 and 4,940.88

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Solution

The fourth proportional to 8,919.85, 12,309.41 and 4,940.88 is: 6,818.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.85 : 12,309.41 = 4,940.88 : x
  2. Step 2: Convert to fraction form
    8,919.85/12,309.41 = 4,940.88/x
  3. Step 3: Cross multiply
    8,919.85x = 12,309.41 × 4,940.88
  4. Step 4: Simplify right side
    8,919.85x = 60,819,292.98
  5. Step 5: Solve for x
    x = 60,819,292.98/8,919.85
  6. Step 6: Final answer
    x = 6,818.42

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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.