Home / 20,583.99-28,407.32-12,520.80

Finding the Fourth Proportional to 20,583.99, 28,407.32 and 12,520.80

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Solution

The fourth proportional to 20,583.99, 28,407.32 and 12,520.80 is: 17,279.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,583.99 : 28,407.32 = 12,520.80 : x
  2. Step 2: Convert to fraction form
    20,583.99/28,407.32 = 12,520.80/x
  3. Step 3: Cross multiply
    20,583.99x = 28,407.32 × 12,520.80
  4. Step 4: Simplify right side
    20,583.99x = 355,682,309.65
  5. Step 5: Solve for x
    x = 355,682,309.65/20,583.99
  6. Step 6: Final answer
    x = 17,279.56

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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.