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Finding the Fourth Proportional to 18,765.86, 28,109.79 and 8,912.90

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Solution

The fourth proportional to 18,765.86, 28,109.79 and 8,912.90 is: 13,350.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.86 : 28,109.79 = 8,912.90 : x
  2. Step 2: Convert to fraction form
    18,765.86/28,109.79 = 8,912.90/x
  3. Step 3: Cross multiply
    18,765.86x = 28,109.79 × 8,912.90
  4. Step 4: Simplify right side
    18,765.86x = 250,539,747.29
  5. Step 5: Solve for x
    x = 250,539,747.29/18,765.86
  6. Step 6: Final answer
    x = 13,350.83

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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.