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Finding the Fourth Proportional to 13,611.10, 18,785.37 and 8,308.99

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Solution

The fourth proportional to 13,611.10, 18,785.37 and 8,308.99 is: 11,467.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.10 : 18,785.37 = 8,308.99 : x
  2. Step 2: Convert to fraction form
    13,611.10/18,785.37 = 8,308.99/x
  3. Step 3: Cross multiply
    13,611.10x = 18,785.37 × 8,308.99
  4. Step 4: Simplify right side
    13,611.10x = 156,087,451.48
  5. Step 5: Solve for x
    x = 156,087,451.48/13,611.10
  6. Step 6: Final answer
    x = 11,467.66

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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.