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Finding the Fourth Proportional to 18,706.39, 28,059.60 and 12,478.57

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Solution

The fourth proportional to 18,706.39, 28,059.60 and 12,478.57 is: 18,717.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,706.39 : 28,059.60 = 12,478.57 : x
  2. Step 2: Convert to fraction form
    18,706.39/28,059.60 = 12,478.57/x
  3. Step 3: Cross multiply
    18,706.39x = 28,059.60 × 12,478.57
  4. Step 4: Simplify right side
    18,706.39x = 350,143,659.42
  5. Step 5: Solve for x
    x = 350,143,659.42/18,706.39
  6. Step 6: Final answer
    x = 18,717.87

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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.