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Finding the Fourth Proportional to 12,661.88, 18,944.61 and 7,645.79

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Solution

The fourth proportional to 12,661.88, 18,944.61 and 7,645.79 is: 11,439.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.88 : 18,944.61 = 7,645.79 : x
  2. Step 2: Convert to fraction form
    12,661.88/18,944.61 = 7,645.79/x
  3. Step 3: Cross multiply
    12,661.88x = 18,944.61 × 7,645.79
  4. Step 4: Simplify right side
    12,661.88x = 144,846,414.97
  5. Step 5: Solve for x
    x = 144,846,414.97/12,661.88
  6. Step 6: Final answer
    x = 11,439.57

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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.