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Finding the Fourth Proportional to 18,986.92, 28,506.30 and 12,092.20

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Solution

The fourth proportional to 18,986.92, 28,506.30 and 12,092.20 is: 18,154.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.92 : 28,506.30 = 12,092.20 : x
  2. Step 2: Convert to fraction form
    18,986.92/28,506.30 = 12,092.20/x
  3. Step 3: Cross multiply
    18,986.92x = 28,506.30 × 12,092.20
  4. Step 4: Simplify right side
    18,986.92x = 344,703,880.86
  5. Step 5: Solve for x
    x = 344,703,880.86/18,986.92
  6. Step 6: Final answer
    x = 18,154.81

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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.