Home / 20,821.87-28,730.78-11,869.54

Finding the Fourth Proportional to 20,821.87, 28,730.78 and 11,869.54

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Solution

The fourth proportional to 20,821.87, 28,730.78 and 11,869.54 is: 16,378.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.87 : 28,730.78 = 11,869.54 : x
  2. Step 2: Convert to fraction form
    20,821.87/28,730.78 = 11,869.54/x
  3. Step 3: Cross multiply
    20,821.87x = 28,730.78 × 11,869.54
  4. Step 4: Simplify right side
    20,821.87x = 341,021,083.09
  5. Step 5: Solve for x
    x = 341,021,083.09/20,821.87
  6. Step 6: Final answer
    x = 16,378.02

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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.