Home / 18,789.81-28,181.66-5,639.86

Finding the Fourth Proportional to 18,789.81, 28,181.66 and 5,639.86

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Solution

The fourth proportional to 18,789.81, 28,181.66 and 5,639.86 is: 8,458.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,789.81 : 28,181.66 = 5,639.86 : x
  2. Step 2: Convert to fraction form
    18,789.81/28,181.66 = 5,639.86/x
  3. Step 3: Cross multiply
    18,789.81x = 28,181.66 × 5,639.86
  4. Step 4: Simplify right side
    18,789.81x = 158,940,616.97
  5. Step 5: Solve for x
    x = 158,940,616.97/18,789.81
  6. Step 6: Final answer
    x = 8,458.87

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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.