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Finding the Fourth Proportional to 18,138.70, 27,175.88 and 15,479.22

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Solution

The fourth proportional to 18,138.70, 27,175.88 and 15,479.22 is: 23,191.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,138.70 : 27,175.88 = 15,479.22 : x
  2. Step 2: Convert to fraction form
    18,138.70/27,175.88 = 15,479.22/x
  3. Step 3: Cross multiply
    18,138.70x = 27,175.88 × 15,479.22
  4. Step 4: Simplify right side
    18,138.70x = 420,661,425.21
  5. Step 5: Solve for x
    x = 420,661,425.21/18,138.70
  6. Step 6: Final answer
    x = 23,191.38

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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.