Home / 20,638.57-28,504.65-13,912.60

Finding the Fourth Proportional to 20,638.57, 28,504.65 and 13,912.60

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Solution

The fourth proportional to 20,638.57, 28,504.65 and 13,912.60 is: 19,215.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.57 : 28,504.65 = 13,912.60 : x
  2. Step 2: Convert to fraction form
    20,638.57/28,504.65 = 13,912.60/x
  3. Step 3: Cross multiply
    20,638.57x = 28,504.65 × 13,912.60
  4. Step 4: Simplify right side
    20,638.57x = 396,573,793.59
  5. Step 5: Solve for x
    x = 396,573,793.59/20,638.57
  6. Step 6: Final answer
    x = 19,215.18

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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.