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Finding the Fourth Proportional to 28,350.72, 42,489.09 and 11,691.72

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Solution

The fourth proportional to 28,350.72, 42,489.09 and 11,691.72 is: 17,522.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,350.72 : 42,489.09 = 11,691.72 : x
  2. Step 2: Convert to fraction form
    28,350.72/42,489.09 = 11,691.72/x
  3. Step 3: Cross multiply
    28,350.72x = 42,489.09 × 11,691.72
  4. Step 4: Simplify right side
    28,350.72x = 496,770,543.33
  5. Step 5: Solve for x
    x = 496,770,543.33/28,350.72
  6. Step 6: Final answer
    x = 17,522.33

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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.