Home / 20,640.42-28,469.27-12,687.03

Finding the Fourth Proportional to 20,640.42, 28,469.27 and 12,687.03

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Solution

The fourth proportional to 20,640.42, 28,469.27 and 12,687.03 is: 17,499.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.42 : 28,469.27 = 12,687.03 : x
  2. Step 2: Convert to fraction form
    20,640.42/28,469.27 = 12,687.03/x
  3. Step 3: Cross multiply
    20,640.42x = 28,469.27 × 12,687.03
  4. Step 4: Simplify right side
    20,640.42x = 361,190,514.29
  5. Step 5: Solve for x
    x = 361,190,514.29/20,640.42
  6. Step 6: Final answer
    x = 17,499.18

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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.