Home / 8,209.20-12,288.96-5,289.60

Finding the Fourth Proportional to 8,209.20, 12,288.96 and 5,289.60

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Solution

The fourth proportional to 8,209.20, 12,288.96 and 5,289.60 is: 7,918.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,209.20 : 12,288.96 = 5,289.60 : x
  2. Step 2: Convert to fraction form
    8,209.20/12,288.96 = 5,289.60/x
  3. Step 3: Cross multiply
    8,209.20x = 12,288.96 × 5,289.60
  4. Step 4: Simplify right side
    8,209.20x = 65,003,682.82
  5. Step 5: Solve for x
    x = 65,003,682.82/8,209.20
  6. Step 6: Final answer
    x = 7,918.39

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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.