Home / 20,878.12-28,810.32-12,379.80

Finding the Fourth Proportional to 20,878.12, 28,810.32 and 12,379.80

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Solution

The fourth proportional to 20,878.12, 28,810.32 and 12,379.80 is: 17,083.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.12 : 28,810.32 = 12,379.80 : x
  2. Step 2: Convert to fraction form
    20,878.12/28,810.32 = 12,379.80/x
  3. Step 3: Cross multiply
    20,878.12x = 28,810.32 × 12,379.80
  4. Step 4: Simplify right side
    20,878.12x = 356,665,999.54
  5. Step 5: Solve for x
    x = 356,665,999.54/20,878.12
  6. Step 6: Final answer
    x = 17,083.24

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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.