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Finding the Fourth Proportional to 18,978.22, 28,529.60 and 17,608.10

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Solution

The fourth proportional to 18,978.22, 28,529.60 and 17,608.10 is: 26,469.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.22 : 28,529.60 = 17,608.10 : x
  2. Step 2: Convert to fraction form
    18,978.22/28,529.60 = 17,608.10/x
  3. Step 3: Cross multiply
    18,978.22x = 28,529.60 × 17,608.10
  4. Step 4: Simplify right side
    18,978.22x = 502,352,049.76
  5. Step 5: Solve for x
    x = 502,352,049.76/18,978.22
  6. Step 6: Final answer
    x = 26,469.92

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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.