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Finding the Fourth Proportional to 13,928.60, 20,909.10 and 8,388.20

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Solution

The fourth proportional to 13,928.60, 20,909.10 and 8,388.20 is: 12,592.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,928.60 : 20,909.10 = 8,388.20 : x
  2. Step 2: Convert to fraction form
    13,928.60/20,909.10 = 8,388.20/x
  3. Step 3: Cross multiply
    13,928.60x = 20,909.10 × 8,388.20
  4. Step 4: Simplify right side
    13,928.60x = 175,389,712.62
  5. Step 5: Solve for x
    x = 175,389,712.62/13,928.60
  6. Step 6: Final answer
    x = 12,592.06

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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.