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Finding the Fourth Proportional to 18,620.53, 27,939.90 and 8,760.79

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Solution

The fourth proportional to 18,620.53, 27,939.90 and 8,760.79 is: 13,145.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.53 : 27,939.90 = 8,760.79 : x
  2. Step 2: Convert to fraction form
    18,620.53/27,939.90 = 8,760.79/x
  3. Step 3: Cross multiply
    18,620.53x = 27,939.90 × 8,760.79
  4. Step 4: Simplify right side
    18,620.53x = 244,775,596.52
  5. Step 5: Solve for x
    x = 244,775,596.52/18,620.53
  6. Step 6: Final answer
    x = 13,145.47

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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.