Home / 21,857.36-30,163.20-11,921.36

Finding the Fourth Proportional to 21,857.36, 30,163.20 and 11,921.36

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Solution

The fourth proportional to 21,857.36, 30,163.20 and 11,921.36 is: 16,451.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,857.36 : 30,163.20 = 11,921.36 : x
  2. Step 2: Convert to fraction form
    21,857.36/30,163.20 = 11,921.36/x
  3. Step 3: Cross multiply
    21,857.36x = 30,163.20 × 11,921.36
  4. Step 4: Simplify right side
    21,857.36x = 359,586,365.95
  5. Step 5: Solve for x
    x = 359,586,365.95/21,857.36
  6. Step 6: Final answer
    x = 16,451.50

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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.