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Finding the Fourth Proportional to 13,687.45, 18,891.61 and 8,648.46

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Solution

The fourth proportional to 13,687.45, 18,891.61 and 8,648.46 is: 11,936.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.45 : 18,891.61 = 8,648.46 : x
  2. Step 2: Convert to fraction form
    13,687.45/18,891.61 = 8,648.46/x
  3. Step 3: Cross multiply
    13,687.45x = 18,891.61 × 8,648.46
  4. Step 4: Simplify right side
    13,687.45x = 163,383,311.80
  5. Step 5: Solve for x
    x = 163,383,311.80/13,687.45
  6. Step 6: Final answer
    x = 11,936.73

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1.5x scale

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.