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Finding the Fourth Proportional to 8,515.81, 11,751.70 and 4,789.81

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Solution

The fourth proportional to 8,515.81, 11,751.70 and 4,789.81 is: 6,609.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515.81 : 11,751.70 = 4,789.81 : x
  2. Step 2: Convert to fraction form
    8,515.81/11,751.70 = 4,789.81/x
  3. Step 3: Cross multiply
    8,515.81x = 11,751.70 × 4,789.81
  4. Step 4: Simplify right side
    8,515.81x = 56,288,410.18
  5. Step 5: Solve for x
    x = 56,288,410.18/8,515.81
  6. Step 6: Final answer
    x = 6,609.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.