Home / 7,115.12-9,819.40-3,929.02

Finding the Fourth Proportional to 7,115.12, 9,819.40 and 3,929.02

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Solution

The fourth proportional to 7,115.12, 9,819.40 and 3,929.02 is: 5,422.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.12 : 9,819.40 = 3,929.02 : x
  2. Step 2: Convert to fraction form
    7,115.12/9,819.40 = 3,929.02/x
  3. Step 3: Cross multiply
    7,115.12x = 9,819.40 × 3,929.02
  4. Step 4: Simplify right side
    7,115.12x = 38,580,584.62
  5. Step 5: Solve for x
    x = 38,580,584.62/7,115.12
  6. Step 6: Final answer
    x = 5,422.34

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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.