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Finding the Fourth Proportional to 13,661.70, 20,471.28 and 8,653.50

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Solution

The fourth proportional to 13,661.70, 20,471.28 and 8,653.50 is: 12,966.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,661.70 : 20,471.28 = 8,653.50 : x
  2. Step 2: Convert to fraction form
    13,661.70/20,471.28 = 8,653.50/x
  3. Step 3: Cross multiply
    13,661.70x = 20,471.28 × 8,653.50
  4. Step 4: Simplify right side
    13,661.70x = 177,148,221.48
  5. Step 5: Solve for x
    x = 177,148,221.48/13,661.70
  6. Step 6: Final answer
    x = 12,966.78

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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.