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Finding the Fourth Proportional to 20,206.80, 30,310.20 and 11,458.80

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Solution

The fourth proportional to 20,206.80, 30,310.20 and 11,458.80 is: 17,188.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,206.80 : 30,310.20 = 11,458.80 : x
  2. Step 2: Convert to fraction form
    20,206.80/30,310.20 = 11,458.80/x
  3. Step 3: Cross multiply
    20,206.80x = 30,310.20 × 11,458.80
  4. Step 4: Simplify right side
    20,206.80x = 347,318,519.76
  5. Step 5: Solve for x
    x = 347,318,519.76/20,206.80
  6. Step 6: Final answer
    x = 17,188.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.