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Finding the Fourth Proportional to 11,203.80, 16,821.90 and 8,449.80

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Solution

The fourth proportional to 11,203.80, 16,821.90 and 8,449.80 is: 12,686.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,203.80 : 16,821.90 = 8,449.80 : x
  2. Step 2: Convert to fraction form
    11,203.80/16,821.90 = 8,449.80/x
  3. Step 3: Cross multiply
    11,203.80x = 16,821.90 × 8,449.80
  4. Step 4: Simplify right side
    11,203.80x = 142,141,690.62
  5. Step 5: Solve for x
    x = 142,141,690.62/11,203.80
  6. Step 6: Final answer
    x = 12,686.92

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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.