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Finding the Fourth Proportional to 15,863.34, 21,891.87 and 8,790.22

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Solution

The fourth proportional to 15,863.34, 21,891.87 and 8,790.22 is: 12,130.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,863.34 : 21,891.87 = 8,790.22 : x
  2. Step 2: Convert to fraction form
    15,863.34/21,891.87 = 8,790.22/x
  3. Step 3: Cross multiply
    15,863.34x = 21,891.87 × 8,790.22
  4. Step 4: Simplify right side
    15,863.34x = 192,434,380.88
  5. Step 5: Solve for x
    x = 192,434,380.88/15,863.34
  6. Step 6: Final answer
    x = 12,130.76

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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.