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Finding the Fourth Proportional to 11,339.81, 16,997.96 and 8,211.99

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Solution

The fourth proportional to 11,339.81, 16,997.96 and 8,211.99 is: 12,309.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,339.81 : 16,997.96 = 8,211.99 : x
  2. Step 2: Convert to fraction form
    11,339.81/16,997.96 = 8,211.99/x
  3. Step 3: Cross multiply
    11,339.81x = 16,997.96 × 8,211.99
  4. Step 4: Simplify right side
    11,339.81x = 139,587,077.54
  5. Step 5: Solve for x
    x = 139,587,077.54/11,339.81
  6. Step 6: Final answer
    x = 12,309.47

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1.5x scale

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.