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Finding the Fourth Proportional to 12,381.44, 18,571.68 and 3,147.68

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Solution

The fourth proportional to 12,381.44, 18,571.68 and 3,147.68 is: 4,721.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,381.44 : 18,571.68 = 3,147.68 : x
  2. Step 2: Convert to fraction form
    12,381.44/18,571.68 = 3,147.68/x
  3. Step 3: Cross multiply
    12,381.44x = 18,571.68 × 3,147.68
  4. Step 4: Simplify right side
    12,381.44x = 58,457,705.70
  5. Step 5: Solve for x
    x = 58,457,705.70/12,381.44
  6. Step 6: Final answer
    x = 4,721.40

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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.