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Finding the Fourth Proportional to 13,788.70, 20,685.11 and 6,393.90

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Solution

The fourth proportional to 13,788.70, 20,685.11 and 6,393.90 is: 9,591.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,788.70 : 20,685.11 = 6,393.90 : x
  2. Step 2: Convert to fraction form
    13,788.70/20,685.11 = 6,393.90/x
  3. Step 3: Cross multiply
    13,788.70x = 20,685.11 × 6,393.90
  4. Step 4: Simplify right side
    13,788.70x = 132,258,570.43
  5. Step 5: Solve for x
    x = 132,258,570.43/13,788.70
  6. Step 6: Final answer
    x = 9,591.81

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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.