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Finding the Fourth Proportional to 20,170.80, 27,836.60 and 11,218.10

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Solution

The fourth proportional to 20,170.80, 27,836.60 and 11,218.10 is: 15,481.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,170.80 : 27,836.60 = 11,218.10 : x
  2. Step 2: Convert to fraction form
    20,170.80/27,836.60 = 11,218.10/x
  3. Step 3: Cross multiply
    20,170.80x = 27,836.60 × 11,218.10
  4. Step 4: Simplify right side
    20,170.80x = 312,273,567.19
  5. Step 5: Solve for x
    x = 312,273,567.19/20,170.80
  6. Step 6: Final answer
    x = 15,481.47

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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.