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Finding the Fourth Proportional to 12,611.68, 18,918.60 and 3,251.61

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Solution

The fourth proportional to 12,611.68, 18,918.60 and 3,251.61 is: 4,877.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,611.68 : 18,918.60 = 3,251.61 : x
  2. Step 2: Convert to fraction form
    12,611.68/18,918.60 = 3,251.61/x
  3. Step 3: Cross multiply
    12,611.68x = 18,918.60 × 3,251.61
  4. Step 4: Simplify right side
    12,611.68x = 61,515,908.95
  5. Step 5: Solve for x
    x = 61,515,908.95/12,611.68
  6. Step 6: Final answer
    x = 4,877.70

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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.