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Finding the Fourth Proportional to 13,806.59, 20,705.09 and 12,920.85

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Solution

The fourth proportional to 13,806.59, 20,705.09 and 12,920.85 is: 19,376.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,806.59 : 20,705.09 = 12,920.85 : x
  2. Step 2: Convert to fraction form
    13,806.59/20,705.09 = 12,920.85/x
  3. Step 3: Cross multiply
    13,806.59x = 20,705.09 × 12,920.85
  4. Step 4: Simplify right side
    13,806.59x = 267,527,297.52
  5. Step 5: Solve for x
    x = 267,527,297.52/13,806.59
  6. Step 6: Final answer
    x = 19,376.79

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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.