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Finding the Fourth Proportional to 18,391.50, 25,380.27 and 10,939.50

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Solution

The fourth proportional to 18,391.50, 25,380.27 and 10,939.50 is: 15,096.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,391.50 : 25,380.27 = 10,939.50 : x
  2. Step 2: Convert to fraction form
    18,391.50/25,380.27 = 10,939.50/x
  3. Step 3: Cross multiply
    18,391.50x = 25,380.27 × 10,939.50
  4. Step 4: Simplify right side
    18,391.50x = 277,647,463.67
  5. Step 5: Solve for x
    x = 277,647,463.67/18,391.50
  6. Step 6: Final answer
    x = 15,096.51

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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.