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Finding the Fourth Proportional to 18,805.43, 28,197.72 and 7,719.93

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Solution

The fourth proportional to 18,805.43, 28,197.72 and 7,719.93 is: 11,575.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.43 : 28,197.72 = 7,719.93 : x
  2. Step 2: Convert to fraction form
    18,805.43/28,197.72 = 7,719.93/x
  3. Step 3: Cross multiply
    18,805.43x = 28,197.72 × 7,719.93
  4. Step 4: Simplify right side
    18,805.43x = 217,684,424.56
  5. Step 5: Solve for x
    x = 217,684,424.56/18,805.43
  6. Step 6: Final answer
    x = 11,575.62

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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.