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Finding the Fourth Proportional to 18,899.39, 28,355.47 and 8,372.03

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Solution

The fourth proportional to 18,899.39, 28,355.47 and 8,372.03 is: 12,560.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,899.39 : 28,355.47 = 8,372.03 : x
  2. Step 2: Convert to fraction form
    18,899.39/28,355.47 = 8,372.03/x
  3. Step 3: Cross multiply
    18,899.39x = 28,355.47 × 8,372.03
  4. Step 4: Simplify right side
    18,899.39x = 237,392,682.80
  5. Step 5: Solve for x
    x = 237,392,682.80/18,899.39
  6. Step 6: Final answer
    x = 12,560.86

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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.