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Finding the Fourth Proportional to 13,906.61, 20,859.92 and 3,376.64

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Solution

The fourth proportional to 13,906.61, 20,859.92 and 3,376.64 is: 5,064.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,906.61 : 20,859.92 = 3,376.64 : x
  2. Step 2: Convert to fraction form
    13,906.61/20,859.92 = 3,376.64/x
  3. Step 3: Cross multiply
    13,906.61x = 20,859.92 × 3,376.64
  4. Step 4: Simplify right side
    13,906.61x = 70,436,319.09
  5. Step 5: Solve for x
    x = 70,436,319.09/13,906.61
  6. Step 6: Final answer
    x = 5,064.95

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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.