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Finding the Fourth Proportional to 21,992.68, 30,349.81 and 11,921.37

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Solution

The fourth proportional to 21,992.68, 30,349.81 and 11,921.37 is: 16,451.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,992.68 : 30,349.81 = 11,921.37 : x
  2. Step 2: Convert to fraction form
    21,992.68/30,349.81 = 11,921.37/x
  3. Step 3: Cross multiply
    21,992.68x = 30,349.81 × 11,921.37
  4. Step 4: Simplify right side
    21,992.68x = 361,811,314.44
  5. Step 5: Solve for x
    x = 361,811,314.44/21,992.68
  6. Step 6: Final answer
    x = 16,451.44

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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.