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Finding the Fourth Proportional to 8,789.70, 13,071.50 and 8,512.86

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Solution

The fourth proportional to 8,789.70, 13,071.50 and 8,512.86 is: 12,659.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,789.70 : 13,071.50 = 8,512.86 : x
  2. Step 2: Convert to fraction form
    8,789.70/13,071.50 = 8,512.86/x
  3. Step 3: Cross multiply
    8,789.70x = 13,071.50 × 8,512.86
  4. Step 4: Simplify right side
    8,789.70x = 111,275,806.93
  5. Step 5: Solve for x
    x = 111,275,806.93/8,789.70
  6. Step 6: Final answer
    x = 12,659.80

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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.