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Finding the Fourth Proportional to 21,286.88, 29,375.88 and 12,339.58

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Solution

The fourth proportional to 21,286.88, 29,375.88 and 12,339.58 is: 17,028.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,286.88 : 29,375.88 = 12,339.58 : x
  2. Step 2: Convert to fraction form
    21,286.88/29,375.88 = 12,339.58/x
  3. Step 3: Cross multiply
    21,286.88x = 29,375.88 × 12,339.58
  4. Step 4: Simplify right side
    21,286.88x = 362,485,874.45
  5. Step 5: Solve for x
    x = 362,485,874.45/21,286.88
  6. Step 6: Final answer
    x = 17,028.61

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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.