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Finding the Fourth Proportional to 18,730.68, 28,100.12 and 7,043.90

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Solution

The fourth proportional to 18,730.68, 28,100.12 and 7,043.90 is: 10,567.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,730.68 : 28,100.12 = 7,043.90 : x
  2. Step 2: Convert to fraction form
    18,730.68/28,100.12 = 7,043.90/x
  3. Step 3: Cross multiply
    18,730.68x = 28,100.12 × 7,043.90
  4. Step 4: Simplify right side
    18,730.68x = 197,934,435.27
  5. Step 5: Solve for x
    x = 197,934,435.27/18,730.68
  6. Step 6: Final answer
    x = 10,567.39

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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.