Home / 21,879.92-30,191.27-12,318.21

Finding the Fourth Proportional to 21,879.92, 30,191.27 and 12,318.21

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Solution

The fourth proportional to 21,879.92, 30,191.27 and 12,318.21 is: 16,997.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.92 : 30,191.27 = 12,318.21 : x
  2. Step 2: Convert to fraction form
    21,879.92/30,191.27 = 12,318.21/x
  3. Step 3: Cross multiply
    21,879.92x = 30,191.27 × 12,318.21
  4. Step 4: Simplify right side
    21,879.92x = 371,902,342.44
  5. Step 5: Solve for x
    x = 371,902,342.44/21,879.92
  6. Step 6: Final answer
    x = 16,997.43

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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.