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Finding the Fourth Proportional to 18,658.89, 27,979.83 and 8,128.49

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Solution

The fourth proportional to 18,658.89, 27,979.83 and 8,128.49 is: 12,189.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,658.89 : 27,979.83 = 8,128.49 : x
  2. Step 2: Convert to fraction form
    18,658.89/27,979.83 = 8,128.49/x
  3. Step 3: Cross multiply
    18,658.89x = 27,979.83 × 8,128.49
  4. Step 4: Simplify right side
    18,658.89x = 227,433,628.46
  5. Step 5: Solve for x
    x = 227,433,628.46/18,658.89
  6. Step 6: Final answer
    x = 12,189.02

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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.