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Finding the Fourth Proportional to 18,876.80, 28,327.95 and 7,189.71

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Solution

The fourth proportional to 18,876.80, 28,327.95 and 7,189.71 is: 10,789.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,876.80 : 28,327.95 = 7,189.71 : x
  2. Step 2: Convert to fraction form
    18,876.80/28,327.95 = 7,189.71/x
  3. Step 3: Cross multiply
    18,876.80x = 28,327.95 × 7,189.71
  4. Step 4: Simplify right side
    18,876.80x = 203,669,745.39
  5. Step 5: Solve for x
    x = 203,669,745.39/18,876.80
  6. Step 6: Final answer
    x = 10,789.42

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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.