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Finding the Fourth Proportional to 20,512.80, 28,659.60 and 20,512.80

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Solution

The fourth proportional to 20,512.80, 28,659.60 and 20,512.80 is: 28,659.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,512.80 : 28,659.60 = 20,512.80 : x
  2. Step 2: Convert to fraction form
    20,512.80/28,659.60 = 20,512.80/x
  3. Step 3: Cross multiply
    20,512.80x = 28,659.60 × 20,512.80
  4. Step 4: Simplify right side
    20,512.80x = 587,888,642.88
  5. Step 5: Solve for x
    x = 587,888,642.88/20,512.80
  6. Step 6: Final answer
    x = 28,659.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.