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Finding the Fourth Proportional to 18,906.92, 28,329.17 and 10,987.20

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Solution

The fourth proportional to 18,906.92, 28,329.17 and 10,987.20 is: 16,462.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.92 : 28,329.17 = 10,987.20 : x
  2. Step 2: Convert to fraction form
    18,906.92/28,329.17 = 10,987.20/x
  3. Step 3: Cross multiply
    18,906.92x = 28,329.17 × 10,987.20
  4. Step 4: Simplify right side
    18,906.92x = 311,258,201.69
  5. Step 5: Solve for x
    x = 311,258,201.69/18,906.92
  6. Step 6: Final answer
    x = 16,462.66

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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.