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Finding the Fourth Proportional to 18,651.80, 25,735.19 and 13,618.73

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Solution

The fourth proportional to 18,651.80, 25,735.19 and 13,618.73 is: 18,790.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,651.80 : 25,735.19 = 13,618.73 : x
  2. Step 2: Convert to fraction form
    18,651.80/25,735.19 = 13,618.73/x
  3. Step 3: Cross multiply
    18,651.80x = 25,735.19 × 13,618.73
  4. Step 4: Simplify right side
    18,651.80x = 350,480,600.35
  5. Step 5: Solve for x
    x = 350,480,600.35/18,651.80
  6. Step 6: Final answer
    x = 18,790.71

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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.