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Finding the Fourth Proportional to 18,905.51, 28,357.11 and 8,372.48

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Solution

The fourth proportional to 18,905.51, 28,357.11 and 8,372.48 is: 12,558.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.51 : 28,357.11 = 8,372.48 : x
  2. Step 2: Convert to fraction form
    18,905.51/28,357.11 = 8,372.48/x
  3. Step 3: Cross multiply
    18,905.51x = 28,357.11 × 8,372.48
  4. Step 4: Simplify right side
    18,905.51x = 237,419,194.55
  5. Step 5: Solve for x
    x = 237,419,194.55/18,905.51
  6. Step 6: Final answer
    x = 12,558.20

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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.