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Finding the Fourth Proportional to 18,704.08, 28,020.13 and 11,686.85

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Solution

The fourth proportional to 18,704.08, 28,020.13 and 11,686.85 is: 17,507.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,704.08 : 28,020.13 = 11,686.85 : x
  2. Step 2: Convert to fraction form
    18,704.08/28,020.13 = 11,686.85/x
  3. Step 3: Cross multiply
    18,704.08x = 28,020.13 × 11,686.85
  4. Step 4: Simplify right side
    18,704.08x = 327,466,992.05
  5. Step 5: Solve for x
    x = 327,466,992.05/18,704.08
  6. Step 6: Final answer
    x = 17,507.78

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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.