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Finding the Fourth Proportional to 20,617.64, 28,452.22 and 11,186

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Solution

The fourth proportional to 20,617.64, 28,452.22 and 11,186 is: 15,436.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,617.64 : 28,452.22 = 11,186 : x
  2. Step 2: Convert to fraction form
    20,617.64/28,452.22 = 11,186/x
  3. Step 3: Cross multiply
    20,617.64x = 28,452.22 × 11,186
  4. Step 4: Simplify right side
    20,617.64x = 318,266,532.92
  5. Step 5: Solve for x
    x = 318,266,532.92/20,617.64
  6. Step 6: Final answer
    x = 15,436.61

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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.