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Finding the Fourth Proportional to 11,091.80, 16,645.80 and 7,811.30

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Solution

The fourth proportional to 11,091.80, 16,645.80 and 7,811.30 is: 11,722.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,091.80 : 16,645.80 = 7,811.30 : x
  2. Step 2: Convert to fraction form
    11,091.80/16,645.80 = 7,811.30/x
  3. Step 3: Cross multiply
    11,091.80x = 16,645.80 × 7,811.30
  4. Step 4: Simplify right side
    11,091.80x = 130,025,337.54
  5. Step 5: Solve for x
    x = 130,025,337.54/11,091.80
  6. Step 6: Final answer
    x = 11,722.65

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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.