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Finding the Fourth Proportional to 21,857.35, 30,163.01 and 12,425.92

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Solution

The fourth proportional to 21,857.35, 30,163.01 and 12,425.92 is: 17,147.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,857.35 : 30,163.01 = 12,425.92 : x
  2. Step 2: Convert to fraction form
    21,857.35/30,163.01 = 12,425.92/x
  3. Step 3: Cross multiply
    21,857.35x = 30,163.01 × 12,425.92
  4. Step 4: Simplify right side
    21,857.35x = 374,803,149.22
  5. Step 5: Solve for x
    x = 374,803,149.22/21,857.35
  6. Step 6: Final answer
    x = 17,147.69

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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.