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Finding the Fourth Proportional to 18,942.19, 28,421.85 and 8,271.86

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Solution

The fourth proportional to 18,942.19, 28,421.85 and 8,271.86 is: 12,411.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,942.19 : 28,421.85 = 8,271.86 : x
  2. Step 2: Convert to fraction form
    18,942.19/28,421.85 = 8,271.86/x
  3. Step 3: Cross multiply
    18,942.19x = 28,421.85 × 8,271.86
  4. Step 4: Simplify right side
    18,942.19x = 235,101,453.05
  5. Step 5: Solve for x
    x = 235,101,453.05/18,942.19
  6. Step 6: Final answer
    x = 12,411.53

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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.