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Finding the Fourth Proportional to 13,609.20, 20,418.60 and 13,129.20

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Solution

The fourth proportional to 13,609.20, 20,418.60 and 13,129.20 is: 19,698.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.20 : 20,418.60 = 13,129.20 : x
  2. Step 2: Convert to fraction form
    13,609.20/20,418.60 = 13,129.20/x
  3. Step 3: Cross multiply
    13,609.20x = 20,418.60 × 13,129.20
  4. Step 4: Simplify right side
    13,609.20x = 268,079,883.12
  5. Step 5: Solve for x
    x = 268,079,883.12/13,609.20
  6. Step 6: Final answer
    x = 19,698.43

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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.