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Finding the Fourth Proportional to 11,121.80, 16,642.20 and 8,205.80

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Solution

The fourth proportional to 11,121.80, 16,642.20 and 8,205.80 is: 12,278.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,121.80 : 16,642.20 = 8,205.80 : x
  2. Step 2: Convert to fraction form
    11,121.80/16,642.20 = 8,205.80/x
  3. Step 3: Cross multiply
    11,121.80x = 16,642.20 × 8,205.80
  4. Step 4: Simplify right side
    11,121.80x = 136,562,564.76
  5. Step 5: Solve for x
    x = 136,562,564.76/11,121.80
  6. Step 6: Final answer
    x = 12,278.82

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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.