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Finding the Fourth Proportional to 12,155.92, 18,234.90 and 3,390.94

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Solution

The fourth proportional to 12,155.92, 18,234.90 and 3,390.94 is: 5,086.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,155.92 : 18,234.90 = 3,390.94 : x
  2. Step 2: Convert to fraction form
    12,155.92/18,234.90 = 3,390.94/x
  3. Step 3: Cross multiply
    12,155.92x = 18,234.90 × 3,390.94
  4. Step 4: Simplify right side
    12,155.92x = 61,833,451.81
  5. Step 5: Solve for x
    x = 61,833,451.81/12,155.92
  6. Step 6: Final answer
    x = 5,086.69

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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.