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Finding the Fourth Proportional to 18,993.76, 28,468.90 and 11,581.75

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Solution

The fourth proportional to 18,993.76, 28,468.90 and 11,581.75 is: 17,359.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,993.76 : 28,468.90 = 11,581.75 : x
  2. Step 2: Convert to fraction form
    18,993.76/28,468.90 = 11,581.75/x
  3. Step 3: Cross multiply
    18,993.76x = 28,468.90 × 11,581.75
  4. Step 4: Simplify right side
    18,993.76x = 329,719,682.58
  5. Step 5: Solve for x
    x = 329,719,682.58/18,993.76
  6. Step 6: Final answer
    x = 17,359.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.