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Finding the Fourth Proportional to 18,879.43, 28,319.28 and 5,731.96

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Solution

The fourth proportional to 18,879.43, 28,319.28 and 5,731.96 is: 8,597.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.43 : 28,319.28 = 5,731.96 : x
  2. Step 2: Convert to fraction form
    18,879.43/28,319.28 = 5,731.96/x
  3. Step 3: Cross multiply
    18,879.43x = 28,319.28 × 5,731.96
  4. Step 4: Simplify right side
    18,879.43x = 162,324,980.19
  5. Step 5: Solve for x
    x = 162,324,980.19/18,879.43
  6. Step 6: Final answer
    x = 8,597.98

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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.