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Finding the Fourth Proportional to 18,513.92, 27,751.44 and 12,668.96

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Solution

The fourth proportional to 18,513.92, 27,751.44 and 12,668.96 is: 18,990.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,513.92 : 27,751.44 = 12,668.96 : x
  2. Step 2: Convert to fraction form
    18,513.92/27,751.44 = 12,668.96/x
  3. Step 3: Cross multiply
    18,513.92x = 27,751.44 × 12,668.96
  4. Step 4: Simplify right side
    18,513.92x = 351,581,883.30
  5. Step 5: Solve for x
    x = 351,581,883.30/18,513.92
  6. Step 6: Final answer
    x = 18,990.14

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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.