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Finding the Fourth Proportional to 15,863.34, 21,891.42 and 8,789.88

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Solution

The fourth proportional to 15,863.34, 21,891.42 and 8,789.88 is: 12,130.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,863.34 : 21,891.42 = 8,789.88 : x
  2. Step 2: Convert to fraction form
    15,863.34/21,891.42 = 8,789.88/x
  3. Step 3: Cross multiply
    15,863.34x = 21,891.42 × 8,789.88
  4. Step 4: Simplify right side
    15,863.34x = 192,422,954.83
  5. Step 5: Solve for x
    x = 192,422,954.83/15,863.34
  6. Step 6: Final answer
    x = 12,130.04

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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.