Home / 21,813.88-30,105.90-12,380.62

Finding the Fourth Proportional to 21,813.88, 30,105.90 and 12,380.62

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Solution

The fourth proportional to 21,813.88, 30,105.90 and 12,380.62 is: 17,086.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,813.88 : 30,105.90 = 12,380.62 : x
  2. Step 2: Convert to fraction form
    21,813.88/30,105.90 = 12,380.62/x
  3. Step 3: Cross multiply
    21,813.88x = 30,105.90 × 12,380.62
  4. Step 4: Simplify right side
    21,813.88x = 372,729,707.66
  5. Step 5: Solve for x
    x = 372,729,707.66/21,813.88
  6. Step 6: Final answer
    x = 17,086.81

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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.