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Finding the Fourth Proportional to 18,911.21, 28,364.82 and 8,381.41

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Solution

The fourth proportional to 18,911.21, 28,364.82 and 8,381.41 is: 12,571.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.21 : 28,364.82 = 8,381.41 : x
  2. Step 2: Convert to fraction form
    18,911.21/28,364.82 = 8,381.41/x
  3. Step 3: Cross multiply
    18,911.21x = 28,364.82 × 8,381.41
  4. Step 4: Simplify right side
    18,911.21x = 237,737,083.65
  5. Step 5: Solve for x
    x = 237,737,083.65/18,911.21
  6. Step 6: Final answer
    x = 12,571.23

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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.