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Finding the Fourth Proportional to 13,620.91, 20,404.03 and 9,930.96

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Solution

The fourth proportional to 13,620.91, 20,404.03 and 9,930.96 is: 14,876.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.91 : 20,404.03 = 9,930.96 : x
  2. Step 2: Convert to fraction form
    13,620.91/20,404.03 = 9,930.96/x
  3. Step 3: Cross multiply
    13,620.91x = 20,404.03 × 9,930.96
  4. Step 4: Simplify right side
    13,620.91x = 202,631,605.77
  5. Step 5: Solve for x
    x = 202,631,605.77/13,620.91
  6. Step 6: Final answer
    x = 14,876.51

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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.