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Finding the Fourth Proportional to 12,611.80, 18,917.70 and 8,723.80

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Solution

The fourth proportional to 12,611.80, 18,917.70 and 8,723.80 is: 13,085.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,611.80 : 18,917.70 = 8,723.80 : x
  2. Step 2: Convert to fraction form
    12,611.80/18,917.70 = 8,723.80/x
  3. Step 3: Cross multiply
    12,611.80x = 18,917.70 × 8,723.80
  4. Step 4: Simplify right side
    12,611.80x = 165,034,231.26
  5. Step 5: Solve for x
    x = 165,034,231.26/12,611.80
  6. Step 6: Final answer
    x = 13,085.70

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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.