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Finding the Fourth Proportional to 18,647.68, 27,913.56 and 13,939.96

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Solution

The fourth proportional to 18,647.68, 27,913.56 and 13,939.96 is: 20,866.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,647.68 : 27,913.56 = 13,939.96 : x
  2. Step 2: Convert to fraction form
    18,647.68/27,913.56 = 13,939.96/x
  3. Step 3: Cross multiply
    18,647.68x = 27,913.56 × 13,939.96
  4. Step 4: Simplify right side
    18,647.68x = 389,113,909.86
  5. Step 5: Solve for x
    x = 389,113,909.86/18,647.68
  6. Step 6: Final answer
    x = 20,866.61

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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.