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Finding the Fourth Proportional to 12,379.68, 18,553.10 and 10,728.50

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Solution

The fourth proportional to 12,379.68, 18,553.10 and 10,728.50 is: 16,078.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,379.68 : 18,553.10 = 10,728.50 : x
  2. Step 2: Convert to fraction form
    12,379.68/18,553.10 = 10,728.50/x
  3. Step 3: Cross multiply
    12,379.68x = 18,553.10 × 10,728.50
  4. Step 4: Simplify right side
    12,379.68x = 199,046,786.94
  5. Step 5: Solve for x
    x = 199,046,786.94/12,379.68
  6. Step 6: Final answer
    x = 16,078.51

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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.