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Finding the Fourth Proportional to 18,871.92, 28,311.45 and 6,388.59

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Solution

The fourth proportional to 18,871.92, 28,311.45 and 6,388.59 is: 9,584.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.92 : 28,311.45 = 6,388.59 : x
  2. Step 2: Convert to fraction form
    18,871.92/28,311.45 = 6,388.59/x
  3. Step 3: Cross multiply
    18,871.92x = 28,311.45 × 6,388.59
  4. Step 4: Simplify right side
    18,871.92x = 180,870,246.36
  5. Step 5: Solve for x
    x = 180,870,246.36/18,871.92
  6. Step 6: Final answer
    x = 9,584.09

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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.