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Finding the Fourth Proportional to 20,910.42, 28,855.80 and 11,478.42

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Solution

The fourth proportional to 20,910.42, 28,855.80 and 11,478.42 is: 15,839.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.42 : 28,855.80 = 11,478.42 : x
  2. Step 2: Convert to fraction form
    20,910.42/28,855.80 = 11,478.42/x
  3. Step 3: Cross multiply
    20,910.42x = 28,855.80 × 11,478.42
  4. Step 4: Simplify right side
    20,910.42x = 331,218,991.84
  5. Step 5: Solve for x
    x = 331,218,991.84/20,910.42
  6. Step 6: Final answer
    x = 15,839.90

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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.