Home / 20,208.20-30,317.78-7,721.65

Finding the Fourth Proportional to 20,208.20, 30,317.78 and 7,721.65

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Solution

The fourth proportional to 20,208.20, 30,317.78 and 7,721.65 is: 11,584.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,208.20 : 30,317.78 = 7,721.65 : x
  2. Step 2: Convert to fraction form
    20,208.20/30,317.78 = 7,721.65/x
  3. Step 3: Cross multiply
    20,208.20x = 30,317.78 × 7,721.65
  4. Step 4: Simplify right side
    20,208.20x = 234,103,095.74
  5. Step 5: Solve for x
    x = 234,103,095.74/20,208.20
  6. Step 6: Final answer
    x = 11,584.56

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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.