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Finding the Fourth Proportional to 18,189, 25,105.32 and 11,121.39

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Solution

The fourth proportional to 18,189, 25,105.32 and 11,121.39 is: 15,350.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,189 : 25,105.32 = 11,121.39 : x
  2. Step 2: Convert to fraction form
    18,189/25,105.32 = 11,121.39/x
  3. Step 3: Cross multiply
    18,189x = 25,105.32 × 11,121.39
  4. Step 4: Simplify right side
    18,189x = 279,206,054.79
  5. Step 5: Solve for x
    x = 279,206,054.79/18,189
  6. Step 6: Final answer
    x = 15,350.27

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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.