Home / 20,872.10-28,804.68-12,379.25

Finding the Fourth Proportional to 20,872.10, 28,804.68 and 12,379.25

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Solution

The fourth proportional to 20,872.10, 28,804.68 and 12,379.25 is: 17,084.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.10 : 28,804.68 = 12,379.25 : x
  2. Step 2: Convert to fraction form
    20,872.10/28,804.68 = 12,379.25/x
  3. Step 3: Cross multiply
    20,872.10x = 28,804.68 × 12,379.25
  4. Step 4: Simplify right side
    20,872.10x = 356,580,406.90
  5. Step 5: Solve for x
    x = 356,580,406.90/20,872.10
  6. Step 6: Final answer
    x = 17,084.07

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1.5x scale

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.