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Finding the Fourth Proportional to 18,781.88, 28,187.11 and 6,946.85

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Solution

The fourth proportional to 18,781.88, 28,187.11 and 6,946.85 is: 10,425.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.88 : 28,187.11 = 6,946.85 : x
  2. Step 2: Convert to fraction form
    18,781.88/28,187.11 = 6,946.85/x
  3. Step 3: Cross multiply
    18,781.88x = 28,187.11 × 6,946.85
  4. Step 4: Simplify right side
    18,781.88x = 195,811,625.54
  5. Step 5: Solve for x
    x = 195,811,625.54/18,781.88
  6. Step 6: Final answer
    x = 10,425.56

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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.