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Finding the Fourth Proportional to 8,778.92, 13,104.75 and 8,128.59

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Solution

The fourth proportional to 8,778.92, 13,104.75 and 8,128.59 is: 12,133.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,778.92 : 13,104.75 = 8,128.59 : x
  2. Step 2: Convert to fraction form
    8,778.92/13,104.75 = 8,128.59/x
  3. Step 3: Cross multiply
    8,778.92x = 13,104.75 × 8,128.59
  4. Step 4: Simplify right side
    8,778.92x = 106,523,121.14
  5. Step 5: Solve for x
    x = 106,523,121.14/8,778.92
  6. Step 6: Final answer
    x = 12,133.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.