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Finding the Fourth Proportional to 21,286.80, 31,930.20 and 10,198.80

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Solution

The fourth proportional to 21,286.80, 31,930.20 and 10,198.80 is: 15,298.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,286.80 : 31,930.20 = 10,198.80 : x
  2. Step 2: Convert to fraction form
    21,286.80/31,930.20 = 10,198.80/x
  3. Step 3: Cross multiply
    21,286.80x = 31,930.20 × 10,198.80
  4. Step 4: Simplify right side
    21,286.80x = 325,649,723.76
  5. Step 5: Solve for x
    x = 325,649,723.76/21,286.80
  6. Step 6: Final answer
    x = 15,298.20

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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.