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Finding the Fourth Proportional to 11,779.92, 16,266.92 and 8,790.56

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Solution

The fourth proportional to 11,779.92, 16,266.92 and 8,790.56 is: 12,138.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,779.92 : 16,266.92 = 8,790.56 : x
  2. Step 2: Convert to fraction form
    11,779.92/16,266.92 = 8,790.56/x
  3. Step 3: Cross multiply
    11,779.92x = 16,266.92 × 8,790.56
  4. Step 4: Simplify right side
    11,779.92x = 142,995,336.28
  5. Step 5: Solve for x
    x = 142,995,336.28/11,779.92
  6. Step 6: Final answer
    x = 12,138.91

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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.