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Finding the Fourth Proportional to 8,691.91, 13,055.34 and 5,188.78

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Solution

The fourth proportional to 8,691.91, 13,055.34 and 5,188.78 is: 7,793.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.91 : 13,055.34 = 5,188.78 : x
  2. Step 2: Convert to fraction form
    8,691.91/13,055.34 = 5,188.78/x
  3. Step 3: Cross multiply
    8,691.91x = 13,055.34 × 5,188.78
  4. Step 4: Simplify right side
    8,691.91x = 67,741,287.09
  5. Step 5: Solve for x
    x = 67,741,287.09/8,691.91
  6. Step 6: Final answer
    x = 7,793.60

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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.