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Finding the Fourth Proportional to 20,404.87, 28,158 and 11,452.88

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Solution

The fourth proportional to 20,404.87, 28,158 and 11,452.88 is: 15,804.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,404.87 : 28,158 = 11,452.88 : x
  2. Step 2: Convert to fraction form
    20,404.87/28,158 = 11,452.88/x
  3. Step 3: Cross multiply
    20,404.87x = 28,158 × 11,452.88
  4. Step 4: Simplify right side
    20,404.87x = 322,490,195.04
  5. Step 5: Solve for x
    x = 322,490,195.04/20,404.87
  6. Step 6: Final answer
    x = 15,804.57

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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.