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Finding the Fourth Proportional to 11,279.80, 16,905.30 and 8,669.80

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Solution

The fourth proportional to 11,279.80, 16,905.30 and 8,669.80 is: 12,993.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,279.80 : 16,905.30 = 8,669.80 : x
  2. Step 2: Convert to fraction form
    11,279.80/16,905.30 = 8,669.80/x
  3. Step 3: Cross multiply
    11,279.80x = 16,905.30 × 8,669.80
  4. Step 4: Simplify right side
    11,279.80x = 146,565,569.94
  5. Step 5: Solve for x
    x = 146,565,569.94/11,279.80
  6. Step 6: Final answer
    x = 12,993.63

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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.