Home / 18,917.90-28,379.91-6,439.04

Finding the Fourth Proportional to 18,917.90, 28,379.91 and 6,439.04

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Solution

The fourth proportional to 18,917.90, 28,379.91 and 6,439.04 is: 9,659.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.90 : 28,379.91 = 6,439.04 : x
  2. Step 2: Convert to fraction form
    18,917.90/28,379.91 = 6,439.04/x
  3. Step 3: Cross multiply
    18,917.90x = 28,379.91 × 6,439.04
  4. Step 4: Simplify right side
    18,917.90x = 182,739,375.69
  5. Step 5: Solve for x
    x = 182,739,375.69/18,917.90
  6. Step 6: Final answer
    x = 9,659.60

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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.