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Finding the Fourth Proportional to 20,661.82, 28,513.60 and 11,230.38

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Solution

The fourth proportional to 20,661.82, 28,513.60 and 11,230.38 is: 15,498.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.82 : 28,513.60 = 11,230.38 : x
  2. Step 2: Convert to fraction form
    20,661.82/28,513.60 = 11,230.38/x
  3. Step 3: Cross multiply
    20,661.82x = 28,513.60 × 11,230.38
  4. Step 4: Simplify right side
    20,661.82x = 320,218,563.17
  5. Step 5: Solve for x
    x = 320,218,563.17/20,661.82
  6. Step 6: Final answer
    x = 15,498.08

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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.