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Finding the Fourth Proportional to 20,751.12, 28,640.07 and 12,255.39

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Solution

The fourth proportional to 20,751.12, 28,640.07 and 12,255.39 is: 16,914.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751.12 : 28,640.07 = 12,255.39 : x
  2. Step 2: Convert to fraction form
    20,751.12/28,640.07 = 12,255.39/x
  3. Step 3: Cross multiply
    20,751.12x = 28,640.07 × 12,255.39
  4. Step 4: Simplify right side
    20,751.12x = 350,995,227.48
  5. Step 5: Solve for x
    x = 350,995,227.48/20,751.12
  6. Step 6: Final answer
    x = 16,914.52

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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.