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Finding the Fourth Proportional to 18,793.03, 28,203.21 and 15,139.39

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Solution

The fourth proportional to 18,793.03, 28,203.21 and 15,139.39 is: 22,720.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,793.03 : 28,203.21 = 15,139.39 : x
  2. Step 2: Convert to fraction form
    18,793.03/28,203.21 = 15,139.39/x
  3. Step 3: Cross multiply
    18,793.03x = 28,203.21 × 15,139.39
  4. Step 4: Simplify right side
    18,793.03x = 426,979,420.39
  5. Step 5: Solve for x
    x = 426,979,420.39/18,793.03
  6. Step 6: Final answer
    x = 22,720.10

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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.