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Finding the Fourth Proportional to 12,611.80, 18,917.70 and 3,251.80

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Solution

The fourth proportional to 12,611.80, 18,917.70 and 3,251.80 is: 4,877.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,611.80 : 18,917.70 = 3,251.80 : x
  2. Step 2: Convert to fraction form
    12,611.80/18,917.70 = 3,251.80/x
  3. Step 3: Cross multiply
    12,611.80x = 18,917.70 × 3,251.80
  4. Step 4: Simplify right side
    12,611.80x = 61,516,576.86
  5. Step 5: Solve for x
    x = 61,516,576.86/12,611.80
  6. Step 6: Final answer
    x = 4,877.70

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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.