Home / 20,858.86-28,787.29-11,907.71

Finding the Fourth Proportional to 20,858.86, 28,787.29 and 11,907.71

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Solution

The fourth proportional to 20,858.86, 28,787.29 and 11,907.71 is: 16,433.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.86 : 28,787.29 = 11,907.71 : x
  2. Step 2: Convert to fraction form
    20,858.86/28,787.29 = 11,907.71/x
  3. Step 3: Cross multiply
    20,858.86x = 28,787.29 × 11,907.71
  4. Step 4: Simplify right side
    20,858.86x = 342,790,527.30
  5. Step 5: Solve for x
    x = 342,790,527.30/20,858.86
  6. Step 6: Final answer
    x = 16,433.81

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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.