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Finding the Fourth Proportional to 9,105.80, 13,661.90 and 8,785.80

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Solution

The fourth proportional to 9,105.80, 13,661.90 and 8,785.80 is: 13,181.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,105.80 : 13,661.90 = 8,785.80 : x
  2. Step 2: Convert to fraction form
    9,105.80/13,661.90 = 8,785.80/x
  3. Step 3: Cross multiply
    9,105.80x = 13,661.90 × 8,785.80
  4. Step 4: Simplify right side
    9,105.80x = 120,030,721.02
  5. Step 5: Solve for x
    x = 120,030,721.02/9,105.80
  6. Step 6: Final answer
    x = 13,181.79

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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.