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Finding the Fourth Proportional to 21,755.92, 30,028.80 and 13,379.44

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Solution

The fourth proportional to 21,755.92, 30,028.80 and 13,379.44 is: 18,467.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,755.92 : 30,028.80 = 13,379.44 : x
  2. Step 2: Convert to fraction form
    21,755.92/30,028.80 = 13,379.44/x
  3. Step 3: Cross multiply
    21,755.92x = 30,028.80 × 13,379.44
  4. Step 4: Simplify right side
    21,755.92x = 401,768,527.87
  5. Step 5: Solve for x
    x = 401,768,527.87/21,755.92
  6. Step 6: Final answer
    x = 18,467.09

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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.