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Finding the Fourth Proportional to 13,611.44, 20,416.92 and 7,755.56

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Solution

The fourth proportional to 13,611.44, 20,416.92 and 7,755.56 is: 11,633.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.44 : 20,416.92 = 7,755.56 : x
  2. Step 2: Convert to fraction form
    13,611.44/20,416.92 = 7,755.56/x
  3. Step 3: Cross multiply
    13,611.44x = 20,416.92 × 7,755.56
  4. Step 4: Simplify right side
    13,611.44x = 158,344,648.08
  5. Step 5: Solve for x
    x = 158,344,648.08/13,611.44
  6. Step 6: Final answer
    x = 11,633.20

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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.