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Finding the Fourth Proportional to 13,641.40, 20,425.65 and 8,684.20

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Solution

The fourth proportional to 13,641.40, 20,425.65 and 8,684.20 is: 13,003.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,641.40 : 20,425.65 = 8,684.20 : x
  2. Step 2: Convert to fraction form
    13,641.40/20,425.65 = 8,684.20/x
  3. Step 3: Cross multiply
    13,641.40x = 20,425.65 × 8,684.20
  4. Step 4: Simplify right side
    13,641.40x = 177,380,429.73
  5. Step 5: Solve for x
    x = 177,380,429.73/13,641.40
  6. Step 6: Final answer
    x = 13,003.10

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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.