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Finding the Fourth Proportional to 13,906.91, 20,759.20 and 12,879.02

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Solution

The fourth proportional to 13,906.91, 20,759.20 and 12,879.02 is: 19,224.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,906.91 : 20,759.20 = 12,879.02 : x
  2. Step 2: Convert to fraction form
    13,906.91/20,759.20 = 12,879.02/x
  3. Step 3: Cross multiply
    13,906.91x = 20,759.20 × 12,879.02
  4. Step 4: Simplify right side
    13,906.91x = 267,358,127.36
  5. Step 5: Solve for x
    x = 267,358,127.36/13,906.91
  6. Step 6: Final answer
    x = 19,224.84

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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.