Home / 7,115.18-9,819.49-3,929.09

Finding the Fourth Proportional to 7,115.18, 9,819.49 and 3,929.09

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Solution

The fourth proportional to 7,115.18, 9,819.49 and 3,929.09 is: 5,422.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.18 : 9,819.49 = 3,929.09 : x
  2. Step 2: Convert to fraction form
    7,115.18/9,819.49 = 3,929.09/x
  3. Step 3: Cross multiply
    7,115.18x = 9,819.49 × 3,929.09
  4. Step 4: Simplify right side
    7,115.18x = 38,581,591.22
  5. Step 5: Solve for x
    x = 38,581,591.22/7,115.18
  6. Step 6: Final answer
    x = 5,422.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.