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Finding the Fourth Proportional to 18,719.62, 28,086.52 and 8,729.48

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Solution

The fourth proportional to 18,719.62, 28,086.52 and 8,729.48 is: 13,097.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.62 : 28,086.52 = 8,729.48 : x
  2. Step 2: Convert to fraction form
    18,719.62/28,086.52 = 8,729.48/x
  3. Step 3: Cross multiply
    18,719.62x = 28,086.52 × 8,729.48
  4. Step 4: Simplify right side
    18,719.62x = 245,180,714.61
  5. Step 5: Solve for x
    x = 245,180,714.61/18,719.62
  6. Step 6: Final answer
    x = 13,097.53

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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.