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Finding the Fourth Proportional to 13,611.61, 18,786.06 and 8,309.50

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Solution

The fourth proportional to 13,611.61, 18,786.06 and 8,309.50 is: 11,468.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.61 : 18,786.06 = 8,309.50 : x
  2. Step 2: Convert to fraction form
    13,611.61/18,786.06 = 8,309.50/x
  3. Step 3: Cross multiply
    13,611.61x = 18,786.06 × 8,309.50
  4. Step 4: Simplify right side
    13,611.61x = 156,102,765.57
  5. Step 5: Solve for x
    x = 156,102,765.57/13,611.61
  6. Step 6: Final answer
    x = 11,468.35

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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.