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Finding the Fourth Proportional to 18,105.72, 27,168.79 and 14,145.90

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Solution

The fourth proportional to 18,105.72, 27,168.79 and 14,145.90 is: 21,226.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,105.72 : 27,168.79 = 14,145.90 : x
  2. Step 2: Convert to fraction form
    18,105.72/27,168.79 = 14,145.90/x
  3. Step 3: Cross multiply
    18,105.72x = 27,168.79 × 14,145.90
  4. Step 4: Simplify right side
    18,105.72x = 384,326,986.46
  5. Step 5: Solve for x
    x = 384,326,986.46/18,105.72
  6. Step 6: Final answer
    x = 21,226.83

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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.