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Finding the Fourth Proportional to 18,910.42, 28,375.18 and 7,825.05

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Solution

The fourth proportional to 18,910.42, 28,375.18 and 7,825.05 is: 11,741.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910.42 : 28,375.18 = 7,825.05 : x
  2. Step 2: Convert to fraction form
    18,910.42/28,375.18 = 7,825.05/x
  3. Step 3: Cross multiply
    18,910.42x = 28,375.18 × 7,825.05
  4. Step 4: Simplify right side
    18,910.42x = 222,037,182.70
  5. Step 5: Solve for x
    x = 222,037,182.70/18,910.42
  6. Step 6: Final answer
    x = 11,741.53

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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.