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Finding the Fourth Proportional to 21,755.39, 30,021.86 and 12,803.42

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Solution

The fourth proportional to 21,755.39, 30,021.86 and 12,803.42 is: 17,668.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,755.39 : 30,021.86 = 12,803.42 : x
  2. Step 2: Convert to fraction form
    21,755.39/30,021.86 = 12,803.42/x
  3. Step 3: Cross multiply
    21,755.39x = 30,021.86 × 12,803.42
  4. Step 4: Simplify right side
    21,755.39x = 384,382,418.74
  5. Step 5: Solve for x
    x = 384,382,418.74/21,755.39
  6. Step 6: Final answer
    x = 17,668.38

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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.