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Finding the Fourth Proportional to 20,859.80, 28,786.88 and 11,427.80

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Solution

The fourth proportional to 20,859.80, 28,786.88 and 11,427.80 is: 15,770.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.80 : 28,786.88 = 11,427.80 : x
  2. Step 2: Convert to fraction form
    20,859.80/28,786.88 = 11,427.80/x
  3. Step 3: Cross multiply
    20,859.80x = 28,786.88 × 11,427.80
  4. Step 4: Simplify right side
    20,859.80x = 328,970,591.90
  5. Step 5: Solve for x
    x = 328,970,591.90/20,859.80
  6. Step 6: Final answer
    x = 15,770.56

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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.