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Finding the Fourth Proportional to 18,435.81, 27,639.13 and 13,170.81

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Solution

The fourth proportional to 18,435.81, 27,639.13 and 13,170.81 is: 19,745.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,435.81 : 27,639.13 = 13,170.81 : x
  2. Step 2: Convert to fraction form
    18,435.81/27,639.13 = 13,170.81/x
  3. Step 3: Cross multiply
    18,435.81x = 27,639.13 × 13,170.81
  4. Step 4: Simplify right side
    18,435.81x = 364,029,729.80
  5. Step 5: Solve for x
    x = 364,029,729.80/18,435.81
  6. Step 6: Final answer
    x = 19,745.80

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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.