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Finding the Fourth Proportional to 8,640.45, 11,971.98 and 8,453.61

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Solution

The fourth proportional to 8,640.45, 11,971.98 and 8,453.61 is: 11,713.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.45 : 11,971.98 = 8,453.61 : x
  2. Step 2: Convert to fraction form
    8,640.45/11,971.98 = 8,453.61/x
  3. Step 3: Cross multiply
    8,640.45x = 11,971.98 × 8,453.61
  4. Step 4: Simplify right side
    8,640.45x = 101,206,449.85
  5. Step 5: Solve for x
    x = 101,206,449.85/8,640.45
  6. Step 6: Final answer
    x = 11,713.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.