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Finding the Fourth Proportional to 13,859.80, 20,766.90 and 8,006.20

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Solution

The fourth proportional to 13,859.80, 20,766.90 and 8,006.20 is: 11,996.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.80 : 20,766.90 = 8,006.20 : x
  2. Step 2: Convert to fraction form
    13,859.80/20,766.90 = 8,006.20/x
  3. Step 3: Cross multiply
    13,859.80x = 20,766.90 × 8,006.20
  4. Step 4: Simplify right side
    13,859.80x = 166,263,954.78
  5. Step 5: Solve for x
    x = 166,263,954.78/13,859.80
  6. Step 6: Final answer
    x = 11,996.13

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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.