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Finding the Fourth Proportional to 18,790, 28,189.68 and 7,103.28

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Solution

The fourth proportional to 18,790, 28,189.68 and 7,103.28 is: 10,656.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,790 : 28,189.68 = 7,103.28 : x
  2. Step 2: Convert to fraction form
    18,790/28,189.68 = 7,103.28/x
  3. Step 3: Cross multiply
    18,790x = 28,189.68 × 7,103.28
  4. Step 4: Simplify right side
    18,790x = 200,239,190.15
  5. Step 5: Solve for x
    x = 200,239,190.15/18,790
  6. Step 6: Final answer
    x = 10,656.69

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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.