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Finding the Fourth Proportional to 13,811.40, 20,738.70 and 7,979.40

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Solution

The fourth proportional to 13,811.40, 20,738.70 and 7,979.40 is: 11,981.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,811.40 : 20,738.70 = 7,979.40 : x
  2. Step 2: Convert to fraction form
    13,811.40/20,738.70 = 7,979.40/x
  3. Step 3: Cross multiply
    13,811.40x = 20,738.70 × 7,979.40
  4. Step 4: Simplify right side
    13,811.40x = 165,482,382.78
  5. Step 5: Solve for x
    x = 165,482,382.78/13,811.40
  6. Step 6: Final answer
    x = 11,981.58

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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.