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Finding the Fourth Proportional to 20,371.54, 30,562.17 and 7,891.87

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Solution

The fourth proportional to 20,371.54, 30,562.17 and 7,891.87 is: 11,839.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,371.54 : 30,562.17 = 7,891.87 : x
  2. Step 2: Convert to fraction form
    20,371.54/30,562.17 = 7,891.87/x
  3. Step 3: Cross multiply
    20,371.54x = 30,562.17 × 7,891.87
  4. Step 4: Simplify right side
    20,371.54x = 241,192,672.56
  5. Step 5: Solve for x
    x = 241,192,672.56/20,371.54
  6. Step 6: Final answer
    x = 11,839.69

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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.