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Finding the Fourth Proportional to 13,798.92, 20,561.28 and 13,129.44

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Solution

The fourth proportional to 13,798.92, 20,561.28 and 13,129.44 is: 19,563.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,798.92 : 20,561.28 = 13,129.44 : x
  2. Step 2: Convert to fraction form
    13,798.92/20,561.28 = 13,129.44/x
  3. Step 3: Cross multiply
    13,798.92x = 20,561.28 × 13,129.44
  4. Step 4: Simplify right side
    13,798.92x = 269,958,092.08
  5. Step 5: Solve for x
    x = 269,958,092.08/13,798.92
  6. Step 6: Final answer
    x = 19,563.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.