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Finding the Fourth Proportional to 15,161.70, 20,922.84 and 8,447.31

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Solution

The fourth proportional to 15,161.70, 20,922.84 and 8,447.31 is: 11,657.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,161.70 : 20,922.84 = 8,447.31 : x
  2. Step 2: Convert to fraction form
    15,161.70/20,922.84 = 8,447.31/x
  3. Step 3: Cross multiply
    15,161.70x = 20,922.84 × 8,447.31
  4. Step 4: Simplify right side
    15,161.70x = 176,741,715.56
  5. Step 5: Solve for x
    x = 176,741,715.56/15,161.70
  6. Step 6: Final answer
    x = 11,657.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.