Home / 20,879.20-31,370.15-13,385.99

Finding the Fourth Proportional to 20,879.20, 31,370.15 and 13,385.99

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Solution

The fourth proportional to 20,879.20, 31,370.15 and 13,385.99 is: 20,111.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.20 : 31,370.15 = 13,385.99 : x
  2. Step 2: Convert to fraction form
    20,879.20/31,370.15 = 13,385.99/x
  3. Step 3: Cross multiply
    20,879.20x = 31,370.15 × 13,385.99
  4. Step 4: Simplify right side
    20,879.20x = 419,920,626.09
  5. Step 5: Solve for x
    x = 419,920,626.09/20,879.20
  6. Step 6: Final answer
    x = 20,111.91

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1.5x scale

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.