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Finding the Fourth Proportional to 8,379.91, 12,578.07 and 8,340.93

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Solution

The fourth proportional to 8,379.91, 12,578.07 and 8,340.93 is: 12,519.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,379.91 : 12,578.07 = 8,340.93 : x
  2. Step 2: Convert to fraction form
    8,379.91/12,578.07 = 8,340.93/x
  3. Step 3: Cross multiply
    8,379.91x = 12,578.07 × 8,340.93
  4. Step 4: Simplify right side
    8,379.91x = 104,912,801.41
  5. Step 5: Solve for x
    x = 104,912,801.41/8,379.91
  6. Step 6: Final answer
    x = 12,519.56

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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.