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Finding the Fourth Proportional to 20,751, 28,636.38 and 13,299

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Solution

The fourth proportional to 20,751, 28,636.38 and 13,299 is: 18,352.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751 : 28,636.38 = 13,299 : x
  2. Step 2: Convert to fraction form
    20,751/28,636.38 = 13,299/x
  3. Step 3: Cross multiply
    20,751x = 28,636.38 × 13,299
  4. Step 4: Simplify right side
    20,751x = 380,835,217.62
  5. Step 5: Solve for x
    x = 380,835,217.62/20,751
  6. Step 6: Final answer
    x = 18,352.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.