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Finding the Fourth Proportional to 18,859.44, 28,290.53 and 6,380.78

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Solution

The fourth proportional to 18,859.44, 28,290.53 and 6,380.78 is: 9,571.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,859.44 : 28,290.53 = 6,380.78 : x
  2. Step 2: Convert to fraction form
    18,859.44/28,290.53 = 6,380.78/x
  3. Step 3: Cross multiply
    18,859.44x = 28,290.53 × 6,380.78
  4. Step 4: Simplify right side
    18,859.44x = 180,515,474.66
  5. Step 5: Solve for x
    x = 180,515,474.66/18,859.44
  6. Step 6: Final answer
    x = 9,571.62

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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.