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Finding the Fourth Proportional to 21,857.68, 30,163.80 and 11,921.68

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Solution

The fourth proportional to 21,857.68, 30,163.80 and 11,921.68 is: 16,452.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,857.68 : 30,163.80 = 11,921.68 : x
  2. Step 2: Convert to fraction form
    21,857.68/30,163.80 = 11,921.68/x
  3. Step 3: Cross multiply
    21,857.68x = 30,163.80 × 11,921.68
  4. Step 4: Simplify right side
    21,857.68x = 359,603,171.18
  5. Step 5: Solve for x
    x = 359,603,171.18/21,857.68
  6. Step 6: Final answer
    x = 16,452.03

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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.