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Finding the Fourth Proportional to 18,694.65, 28,039.62 and 8,171.91

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Solution

The fourth proportional to 18,694.65, 28,039.62 and 8,171.91 is: 12,256.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,694.65 : 28,039.62 = 8,171.91 : x
  2. Step 2: Convert to fraction form
    18,694.65/28,039.62 = 8,171.91/x
  3. Step 3: Cross multiply
    18,694.65x = 28,039.62 × 8,171.91
  4. Step 4: Simplify right side
    18,694.65x = 229,137,314.61
  5. Step 5: Solve for x
    x = 229,137,314.61/18,694.65
  6. Step 6: Final answer
    x = 12,256.84

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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.