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Finding the Fourth Proportional to 18,991.86, 28,497.99 and 7,906.20

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Solution

The fourth proportional to 18,991.86, 28,497.99 and 7,906.20 is: 11,863.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.86 : 28,497.99 = 7,906.20 : x
  2. Step 2: Convert to fraction form
    18,991.86/28,497.99 = 7,906.20/x
  3. Step 3: Cross multiply
    18,991.86x = 28,497.99 × 7,906.20
  4. Step 4: Simplify right side
    18,991.86x = 225,310,808.54
  5. Step 5: Solve for x
    x = 225,310,808.54/18,991.86
  6. Step 6: Final answer
    x = 11,863.55

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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.